[clang] [llvm] [RISCV] Add support for getHostCPUFeatures using hwprobe (PR #94352)

[Yingwei Zheng via cfe-commits]

================
@@ -290,8 +290,24 @@ std::string riscv::getRISCVArch(const llvm::opt::ArgList 
&Args,
   // 2. Get march (isa string) based on `-mcpu=`
   if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
     StringRef CPU = A->getValue();
-    if (CPU == "native")
+    if (CPU == "native") {
       CPU = llvm::sys::getHostCPUName();
+      // If the target cpu is unrecognized, use target features.
+      if (CPU.empty() || CPU.starts_with("generic")) {
----------------
dtcxzyw wrote:

Done.

https://github.com/llvm/llvm-project/pull/94352
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