[llvm] [GlobalOpt] Update debug info when changing CC to Fast (PR #144303)

[Hans Wennborg via llvm-commits]

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@@ -1920,6 +1920,14 @@ static void RemovePreallocated(Function *F) {
   }
 }
 
+static unsigned char GetDebugInfoFastCC(const Triple &Triple) {
+  if (Triple.isOSWindows() && Triple.isArch32Bit()) {
+    return llvm::dwarf::DW_CC_BORLAND_msfastcall;
+  }
+
+  return llvm::dwarf::DW_CC_normal;
+}
+
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zmodem wrote:

If we don't go the route of dropping it from the metadata, maybe the verifier could check for Function/metadata calling convention consistency?

https://github.com/llvm/llvm-project/pull/144303