[llvm] [IR][RISCV] Add llvm.vector.(de)interleave3/5/7 (PR #124825)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-x86_64-debian-dylib` running on `gribozavr4` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/60/builds/18926

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

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /b/1/llvm-x86_64-debian-dylib/build/bin/llc < /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll -mtriple=riscv32 -mattr=+v,+zvfh | /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll --check-prefixes=CHECK,RV32
+ /b/1/llvm-x86_64-debian-dylib/build/bin/llc -mtriple=riscv32 -mattr=+v,+zvfh
+ /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll --check-prefixes=CHECK,RV32
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll:250:14: error: RV32-NEXT: expected string not found in input
; RV32-NEXT: vslidedown.vi v10, v8, 10
             ^
<stdin>:286:34: note: scanning from here
 vsetivli zero, 2, e8, m1, ta, ma
                                 ^
<stdin>:287:2: note: possible intended match here
 vslidedown.vi v11, v8, 10
 ^

Input file: <stdin>
Check file: /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-fixed.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            .
            .
            .
          281:  sub sp, sp, a0 
          282:  .cfi_escape 0x0f, 0x0d, 0x72, 0x00, 0x11, 0x30, 0x22, 0x11, 0x04, 0x92, 0xa2, 0x38, 0x00, 0x1e, 0x22 # sp + 48 + 4 * vlenb 
          283:  addi a0, sp, 32 
          284:  vs1r.v v8, (a0) # Unknown-size Folded Spill 
          285:  csrr s1, vlenb 
          286:  vsetivli zero, 2, e8, m1, ta, ma 
next:250'0                                      X error: no match found
          287:  vslidedown.vi v11, v8, 10 
next:250'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
next:250'1      ?                          possible intended match
          288:  vslidedown.vi v10, v8, 8 
next:250'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~
          289:  vslidedown.vi v9, v8, 2 
next:250'0     ~~~~~~~~~~~~~~~~~~~~~~~~~
          290:  srli s0, s1, 3 
next:250'0     ~~~~~~~~~~~~~~~~
          291:  add a0, s0, s0 
next:250'0     ~~~~~~~~~~~~~~~~
          292:  vsetvli zero, a0, e8, mf2, tu, ma 
next:250'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            .
            .
...

```

</details>

https://github.com/llvm/llvm-project/pull/124825