[clang] [llvm] [RISCV] Add sifive-p670 processor (PR #79015)

[Wang Pengcheng via cfe-commits]

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@@ -241,7 +241,17 @@
 // MCPU-SIFIVE-P450-SAME: "-target-feature" "+zbb"
 // MCPU-SIFIVE-P450-SAME: "-target-feature" "+zbs"
 // MCPU-SIFIVE-P450-SAME: "-target-abi" "lp64d"
-//
+
+// RUN: %clang -target riscv64 -### -c %s 2>&1 -mcpu=sifive-p670 | FileCheck -check-prefix=MCPU-SIFIVE-P670 %s
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wangpc-pp wrote:

One feature one line?

https://github.com/llvm/llvm-project/pull/79015