[clang] [llvm] [RISCV] Add processor definition for SiFive P870 (PR #137725)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `clang,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/15497

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Driver/riscv-cpus.c' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=rocket-rv32 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-ROCKET32 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 3
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=rocket-rv32
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-ROCKET32 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=rocket-rv64 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-ROCKET64 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 7
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=rocket-rv64
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-ROCKET64 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=syntacore-scr1-base | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-SYNTACORE-SCR1-BASE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 11
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=syntacore-scr1-base
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-SYNTACORE-SCR1-BASE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=syntacore-scr1-max | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-SYNTACORE-SCR1-MAX /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 17
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=syntacore-scr1-max
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-SYNTACORE-SCR1-MAX /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=xiangshan-nanhu | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-XIANGSHAN-NANHU /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 23
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-XIANGSHAN-NANHU /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=xiangshan-nanhu
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=xiangshan-kunminghu | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-XIANGSHAN-KUNMINGHU /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 34
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=xiangshan-kunminghu
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-XIANGSHAN-KUNMINGHU /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=spacemit-x60 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-SPACEMIT-X60 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 106
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=spacemit-x60
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-SPACEMIT-X60 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=native 2> /buildbot/worker/arc-folder/build/tools/clang/test/Driver/Output/riscv-cpus.c.tmp.err || true # RUN: at line 163
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=native
+ true
/buildbot/worker/arc-folder/build/bin/FileCheck --input-file=/buildbot/worker/arc-folder/build/tools/clang/test/Driver/Output/riscv-cpus.c.tmp.err -check-prefix=MCPU-NATIVE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 164
+ /buildbot/worker/arc-folder/build/bin/FileCheck --input-file=/buildbot/worker/arc-folder/build/tools/clang/test/Driver/Output/riscv-cpus.c.tmp.err -check-prefix=MCPU-NATIVE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mtune=rocket-rv32 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-ROCKET32 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 167
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mtune=rocket-rv32
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-ROCKET32 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mtune=rocket-rv64 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-ROCKET64 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 170
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mtune=rocket-rv64
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-ROCKET64 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mtune=mips-p8700 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-MIPS-P8700 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 173
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mtune=mips-p8700
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-MIPS-P8700 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mcpu=mips-p8700 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-MIPS-P8700 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 176
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mcpu=mips-p8700
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MCPU-MIPS-P8700 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mtune=syntacore-scr1-base | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-SYNTACORE-SCR1-BASE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 190
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mtune=syntacore-scr1-base
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-SYNTACORE-SCR1-BASE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mtune=syntacore-scr1-max | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-SYNTACORE-SCR1-MAX /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 193
+ /buildbot/worker/arc-folder/build/bin/clang --target=riscv32 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c -mtune=syntacore-scr1-max
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-SYNTACORE-SCR1-MAX /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c
/buildbot/worker/arc-folder/build/bin/clang --target=riscv64 -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c 2>&1 -mtune=tt-ascalon-d8 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=MTUNE-TT-ASCALON-D8 /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/riscv-cpus.c # RUN: at line 196
...

```

</details>

https://github.com/llvm/llvm-project/pull/137725