Revert r345330 "Add MS ABI mangling for operator<=>."

The generated MS manglings differ between 32- and 64-bit, and the test only
expects the latter. See also the commit email thread.

> Thanks to Cameron DaCamara at Microsoft for letting us know what their
> chosen mangling is here!

llvm-svn: 345380

1 files changed, 9 insertions, 2 deletions

diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp
index 34e070ab33d..072184d82e8 100644
--- a/clang/lib/AST/MicrosoftMangle.cpp
+++ b/clang/lib/AST/MicrosoftMangle.cpp
@@ -1240,8 +1240,15 @@ void MicrosoftCXXNameMangler::mangleOperatorName(OverloadedOperatorKind OO,
   case OO_Array_Delete: Out << "?_V"; break;
   // <operator-name> ::= ?__L # co_await
   case OO_Coawait: Out << "?__L"; break;
-  // <operator-name> ::= ?__M # <=>
-  case OO_Spaceship: Out << "?__M"; break;
+
+  case OO_Spaceship: {
+    // FIXME: Once MS picks a mangling, use it.
+    DiagnosticsEngine &Diags = Context.getDiags();
+    unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
+      "cannot mangle this three-way comparison operator yet");
+    Diags.Report(Loc, DiagID);
+    break;
+  }
 
   case OO_Conditional: {
     DiagnosticsEngine &Diags = Context.getDiags();