[clang] [llvm] [RISCV] Support RISC-V Profiles in -march option (PR #76357)

[Wang Pengcheng via llvm-commits]

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@@ -854,6 +854,81 @@ RISCVISAInfo::parseArchString(StringRef Arch, bool EnableExperimentalExtension,
                              "string must be lowercase");
   }
 
+  bool IsProfile = Arch.starts_with("rvi") || Arch.starts_with("rva") ||
+                   Arch.starts_with("rvb") || Arch.starts_with("rvm");
+  std::string NewArch;
+  if (IsProfile) {
+    // A mapping from profile name to march string with all mandatory
+    // extensions.
+    static const std::map<StringLiteral, StringLiteral> SupportedProfiles = {
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wangpc-pp wrote:

Is there a global constructor/destructor if it is inside a function and lazily initialized?

https://github.com/llvm/llvm-project/pull/76357