AMDGPU: Remove nocapture attribute from is.shared and is.private intrinsics (#129238)

This should be replaced with captures(address), but tablegen currently
has
no way to indicate that on an intrinsic. I opened issue #129184 to fix
this.

Author: arsenm

llvm/include/llvm/IR/IntrinsicsAMDGPU.td

@@ -2529,13 +2529,13 @@ def int_amdgcn_set_inactive_chain_arg :
 // Return if the given flat pointer points to a local memory address.
 def int_amdgcn_is_shared : ClangBuiltin<"__builtin_amdgcn_is_shared">,
   DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_ptr_ty],
-  [IntrNoMem, IntrSpeculatable, NoCapture<ArgIndex<0>>]
+  [IntrNoMem, IntrSpeculatable] // FIXME: This should be captures(ret: address)
 >;
 
 // Return if the given flat pointer points to a prvate memory address.
 def int_amdgcn_is_private : ClangBuiltin<"__builtin_amdgcn_is_private">,
   DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_ptr_ty],
-  [IntrNoMem, IntrSpeculatable, NoCapture<ArgIndex<0>>]
+  [IntrNoMem, IntrSpeculatable] // FIXME: This should be captures(ret: address)
 >;
 
 // A uniform tail call to a function with the `amdgpu_cs_chain` or