[c++2a] P0515R3: Support for overloaded operator<=>.

No CodeGen support for MSABI yet, we don't know how to mangle this there.

llvm-svn: 319513
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index 6cc77f6..00ef0da 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -1384,6 +1384,10 @@
   case OO_GreaterEqual:
     BinaryOp = BO_GE;
     return Stmt::BinaryOperatorClass;
+
+  case OO_Spaceship:
+    // FIXME: Update this once we support <=> expressions.
+    llvm_unreachable("<=> expressions not supported yet");
       
   case OO_AmpAmp:
     BinaryOp = BO_LAnd;