[clang] [CIR] Cleanup support for C functions (PR #136854)

[Andy Kaylor via cfe-commits]

================
@@ -524,7 +523,9 @@ CIRGenTypes::arrangeCIRFunctionInfo(CanQualType returnType) {
   if (retInfo.canHaveCoerceToType() && retInfo.getCoerceToType() == nullptr)
     retInfo.setCoerceToType(convertType(fi->getReturnType()));
 
-  assert(!cir::MissingFeatures::opCallArgs());
+  for (auto &i : fi->arguments())
----------------
andykaylor wrote:

Don't use auto here.

https://github.com/llvm/llvm-project/pull/136854