IR: Remove extra name mangling from llvm.ptrmask

[arsenm]

Summary

This should not be allowed to change the address space of the source
and result, so the pointer types should match. The only emitter of
this seems to be a disable clang change, so no tests to update.

[fhahn]

LGTM thanks. It should indeed not change the pointer types. The LangRef already uses the same type for return value and argument, so no update should be needed there.

[arsenm]

adda9c0a4f6323f7d5c4b324b6dccea1e06d0fee

llvm/include/llvm/IR/Intrinsics.td

def int_clear_cache : Intrinsic<[], [llvm_ptr_ty, llvm_ptr_ty],
                                 [], "llvm.clear_cache">;
 
 // Intrinsic to detect whether its argument is a constant.
 def int_is_constant : Intrinsic<[llvm_i1_ty], [llvm_any_ty],
                                 [IntrNoMem, IntrWillReturn, IntrConvergent],
                                 "llvm.is.constant">;
 
 // Intrinsic to mask out bits of a pointer.
-def int_ptrmask: Intrinsic<[llvm_anyptr_ty], [llvm_anyptr_ty, llvm_anyint_ty],
+def int_ptrmask: Intrinsic<[llvm_anyptr_ty], [LLVMMatchType<0>, llvm_anyint_ty],
                            [IntrNoMem, IntrSpeculatable, IntrWillReturn]>;
 
 //===---------------- Vector Predication Intrinsics --------------===//
 
 // Binary operators
 let IntrProperties = [IntrNoMem, IntrNoSync, IntrWillReturn] in {
   def int_vp_add : Intrinsic<[ llvm_anyvector_ty ],
                              [ LLVMMatchType<0>,