[clang] [llvm] [RISCV] Add sifive-p470 processor (PR #102022)

[Pengcheng Wang via cfe-commits]

================
@@ -304,6 +304,16 @@
 // MCPU-SIFIVE-P450-SAME: "-target-feature" "+zbs"
 // MCPU-SIFIVE-P450-SAME: "-target-abi" "lp64d"
 
+// RUN: %clang -target riscv64 -### -c %s 2>&1 -mcpu=sifive-p470 | FileCheck -check-prefix=MCPU-SIFIVE-P470 %s
+// MCPU-SIFIVE-P470: "-target-cpu" "sifive-p470"
----------------
wangpc-pp wrote:

One feature one line please. :-)

https://github.com/llvm/llvm-project/pull/102022