[clang] [llvm] [RISCV] Mark {vl, vtype} as clobber in inline assembly (PR #128636)

[Pengcheng Wang via cfe-commits]

================
@@ -68,7 +68,7 @@ class RISCVTargetInfo : public TargetInfo {
     return TargetInfo::VoidPtrBuiltinVaList;
   }
 
-  std::string_view getClobbers() const override { return ""; }
+  std::string_view getClobbers() const override { return "~{vl},~{vtype}"; }
----------------
wangpc-pp wrote:

```suggestion
  std::string_view getClobbers() const override {
    if (ISAInfo->hasExtension("zve32x"))
      return "~{vl},~{vtype}";
    return "";
  }
```

https://github.com/llvm/llvm-project/pull/128636
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