[clang] [llvm] [HLSL] Adding Flatten and Branch if attributes (PR #116331)

[Chris B via cfe-commits]

================
@@ -0,0 +1,43 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-compute -ast-dump %s | 
FileCheck %s
+
+// CHECK: FunctionDecl 0x{{[0-9A-Fa-f]+}} <{{.*}}> {{.*}} used branch 'int 
(int)'
+// CHECK: AttributedStmt 0x{{[0-9A-Fa-f]+}} <<invalid sloc>
+// CHECK-NEXT: -HLSLControlFlowHintAttr 0x{{[0-9A-Fa-f]+}} <{{.*}}> branch
+export int branch(int X){
+    int resp;
+    [branch] if (X > 0) {
+        resp = -X;
+    } else {
+        resp = X * 2;
+    }
+
+    return resp;
+}
+
+// CHECK: FunctionDecl 0x{{[0-9A-Fa-f]+}} <{{.*}}> {{.*}} used flatten 'int 
(int)'
+// CHECK: AttributedStmt 0x{{[0-9A-Fa-f]+}} <<invalid sloc>
+// CHECK-NEXT: -HLSLControlFlowHintAttr 0x{{[0-9A-Fa-f]+}} <{{.*}}> flatten
+export int flatten(int X){
+    int resp;
+    [flatten] if (X > 0) {
+        resp = -X;
+    } else {
+        resp = X * 2;
+    }
+
+    return resp;
+}
+
+// CHECK: FunctionDecl 0x{{[0-9A-Fa-f]+}} <{{.*}}> {{.*}} used no_attr 'int 
(int)'
+// CHECK-NO: AttributedStmt 0x{{[0-9A-Fa-f]+}} <<invalid sloc>
+// CHECK-NO: -HLSLControlFlowHintAttr
----------------
llvm-beanz wrote:

```suggestion
// CHECK-NOT: AttributedStmt 0x{{[0-9A-Fa-f]+}} <<invalid sloc>
// CHECK-NOT: -HLSLControlFlowHintAttr
```

This test isn't testing what you think it is... 😄

https://github.com/llvm/llvm-project/pull/116331
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