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

[Matt Arsenault via llvm-commits]

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@@ -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 capture(caddress)
----------------
arsenm wrote:

```suggestion
  [IntrNoMem, IntrSpeculatable] // FIXME: This should be captures(ret: address)
```

https://github.com/llvm/llvm-project/pull/129238