[clang] [Sparc][clang] make `_Complex` ABI GCC-compatible (PR #212340)

[Sergei Barannikov via cfe-commits]

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@@ -277,6 +310,15 @@ ABIArgInfo SparcV9ABIInfo::classifyType(QualType Ty, unsigned SizeLimit,
       return ABIArgInfo::getExtend(Ty);
     }
 
+  // When being GCC-compatible, cast a complex integer to an integer type
+  // of the right size to get the correct scalar-like behavior.
+  if (isComplexGnuABI(*this))
+    if (const auto *CT = Ty->getAs<ComplexType>();
+        CT && Size < 64 && CT->getElementType()->isIntegerType()) {
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s-barannikov wrote:

nit: Here and in the other place: checking the size of the *element* would be cleaner

https://github.com/llvm/llvm-project/pull/212340