[clang] [clang] Add Swift support for MIPS (PR #205461)

[Yuta Saito via cfe-commits]

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@@ -433,6 +433,17 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
   std::pair<unsigned, unsigned> hardwareInterferenceSizes() const override {
     return std::make_pair(32, 32);
   }
+
+  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
+    switch (CC) {
+    case CC_Swift:
+      return CCCR_OK;
+    case CC_SwiftAsync:
+      return CCCR_Error;
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kateinoigakukun wrote:

Would you mind sharing the rationale on why we cannot enable `swiftasynccc` for MIPS? I suppose it has everything needed to implement tail call?

https://github.com/llvm/llvm-project/pull/205461