[clang] [C++20] Fix a crash with spaceship and vector types (PR #139767)

[Aaron Ballman via cfe-commits]

================
@@ -8651,6 +8651,11 @@ class DefaultedComparisonAnalyzer
         assert(Best->BuiltinParamTypes[2].isNull() &&
                "invalid builtin comparison");
 
+        // FIXME: If the type we deduced is a vector type, we mark the
+        // comparison as deleted because we don't yet support this.
+        if (isa<VectorType>(T))
+          return Result::deleted();
----------------
AaronBallman wrote:

Oh, I missed the "explain deleted" code paths entirely. I'll address that.

https://github.com/llvm/llvm-project/pull/139767