add warning flag for vector out of bounds warning. fix test

Author: spall

clang/include/clang/Basic/DiagnosticGroups.td

@@ -930,6 +930,7 @@ def SuperSubClassMismatch : DiagGroup<"super-class-method-mismatch">;
 def OverridingMethodMismatch : DiagGroup<"overriding-method-mismatch">;
 def VariadicMacros : DiagGroup<"variadic-macros">;
 def VectorConversion : DiagGroup<"vector-conversion">;      // clang specific
+def VectorOutOfRange : DiagGroup<"vector-out-of-range">;
 def VexingParse : DiagGroup<"vexing-parse">;
 def VLAUseStaticAssert : DiagGroup<"vla-extension-static-assert">;
 def VLACxxExtension : DiagGroup<"vla-cxx-extension", [VLAUseStaticAssert]>;

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -10638,7 +10638,8 @@ def err_sizeless_nonlocal : Error<
 def err_vector_index_out_of_range : Error<
   "vector element index %0 is out of bounds">;
 def warn_vector_index_out_of_range : Warning<
-  "vector element index %0 is out of bounds">;
+  "vector element index %0 is out of bounds">,
+  InGroup<VectorOutOfRange>, DefaultIgnore;
 
 def err_vec_builtin_non_vector : Error<
  "%select{first two|all}1 arguments to %0 must be vectors">;

clang/test/SemaHLSL/Language/VectorOutOfRange-errors.hlsl

@@ -3,17 +3,17 @@
 export void fn1() {
   int2 A = {1,2};
   int X = A[-1];
-  // expected-error@-1 {{vector element index '-1' is out of bounds}}
+  // expected-error@-1 {{vector element index -1 is out of bounds}}
 }
 
 export void fn2() {
   int4 A = {1,2,3,4};
   int X = A[4];
-  // expected-error@-1 {{vector element index '4' is out of bounds}}
+  // expected-error@-1 {{vector element index 4 is out of bounds}}
 }
 
 export void fn3() {
   bool2 A = {true,true};
   bool X = A[-1];
-  // expected-error@-1 {{vector element index '-1' is out of bounds}}
+  // expected-error@-1 {{vector element index -1 is out of bounds}}
 }