[clang] [HLSL] Fix casting asserts (PR #82827)

[Chris B via cfe-commits]

================
@@ -28,3 +29,46 @@ void Fn2(int16_t2 S);
 void Call2(int2 I) {
   Fn2(I);
 }
+
+void Fn3( int64_t2 p0);
+
+// CHECK: FunctionDecl {{.*}} Call3 'void (half2)'
+// CHECK: CallExpr {{.*}} 'void'
+// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(int64_t2)' <FunctionToPointerDecay>
+// CHECK-NEXT: DeclRefExpr {{.*}} 'void (int64_t2)' lvalue Function {{.*}} 'Fn3' 'void (int64_t2)'
+// CHECK-NEXT: ImplicitCastExpr {{.*}} 'int64_t2':'long __attribute__((ext_vector_type(2)))' <FloatingToIntegral>
+// CHECK-NEXT: ImplicitCastExpr {{.*}} 'half2':'half __attribute__((ext_vector_type(2)))' <LValueToRValue>
+// CHECK-NEXT: DeclRefExpr {{.*}} 'half2':'half __attribute__((ext_vector_type(2)))' lvalue ParmVar {{.*}} 'p0' 'half2':'half __attribute__((ext_vector_type(2)))'
+// CHECKIR-LABEL: Call3
+// CHECKIR: %conv = fptosi <2 x half> {{.*}} to <2 x i64>
+void Call3(half2 p0) {
+  Fn3(p0);
+}
+
+// CHECK: FunctionDecl {{.*}} Call4 'void (float2)'
+// CHECK: CallExpr {{.*}} 'void'
+// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(int64_t2)' <FunctionToPointerDecay>
+// CHECK-NEXT: DeclRefExpr {{.*}} 'void (int64_t2)' lvalue Function {{.*}} 'Fn3' 'void (int64_t2)'
+// CHECK-NEXT: ImplicitCastExpr {{.*}} 'int64_t2':'long __attribute__((ext_vector_type(2)))' <FloatingToIntegral>
+// CHECK-NEXT: ImplicitCastExpr {{.*}} 'float2':'float __attribute__((ext_vector_type(2)))' <LValueToRValue>
+// CHECK-NEXT: DeclRefExpr {{.*}} 'float2':'float __attribute__((ext_vector_type(2)))' lvalue ParmVar {{.*}} 'p0' 'float2':'float __attribute__((ext_vector_type(2)))'
+// CHECKIR-LABEL: Call4
+// CHECKIR: %conv = fptosi <2 x float> {{.*}} to <2 x i64>
----------------
llvm-beanz wrote:

```suggestion
// CHECKIR: {{.*}} = fptosi <2 x float> {{.*}} to <2 x i64>
```

https://github.com/llvm/llvm-project/pull/82827