[Clang] Allow intel_reqd_sub_group_size attr for CUDA SPIRV (#25953)

llvm/llvm-project@df13acf
is adding support of it in cudaSPIRV

We customized the attr, we should allow it for CUDA to be consistent
with llorg.

Fixes failures in 

Clang::CodeGenCUDASPIRV/spirv-attrs.cu
Clang::SemaCUDA/spirv-attrs.cu

Author: jsji

clang/include/clang/Basic/Attr.td

@@ -2223,7 +2223,7 @@ def IntelReqdSubGroupSize: InheritableAttr {
   let Args = [ExprArgument<"Value">];
   let Subjects = SubjectList<[Function], ErrorDiag>;
   let Documentation = [IntelReqdSubGroupSizeDocs];
-  let LangOpts = [OpenCL, SYCLIsDevice, SilentlyIgnoreSYCLIsHost];
+  let LangOpts = [OpenCL, SYCLIsDevice, SilentlyIgnoreSYCLIsHost, CUDA];
   let SupportsNonconformingLambdaSyntax = 1;
   let Accessors =
     [Accessor<"isSYCL2020Spelling", [CXX11<"intel", "sub_group_size">]>];