Teach Type::isRealType() that vector types are never real types. All

of the callers of isRealType() already assumed this, and one of them
(increment/decrement) mistakenly permitted increments of vector types
because of it.

llvm-svn: 106596

clang/lib/AST/Type.cpp

@@ -585,8 +585,6 @@ bool Type::isRealType() const {
            BT->getKind() <= BuiltinType::LongDouble;
   if (const TagType *TT = dyn_cast<TagType>(CanonicalType))
     return TT->getDecl()->isEnum() && TT->getDecl()->isDefinition();
-  if (const VectorType *VT = dyn_cast<VectorType>(CanonicalType))
-    return VT->getElementType()->isRealType();
   return false;
 }
 

clang/test/Sema/ext_vector_casts.c

@@ -45,3 +45,7 @@ static void test() {
 }
 
 typedef __attribute__(( ext_vector_type(2) )) float2 vecfloat2; // expected-error{{invalid vector type 'float2'}}
+
+void inc(float2 f2) {
+  f2++; // expected-error{{cannot increment value of type 'float2'}}
+}