Teach GlobalISelEmitter to treat used iPTRAny operands as pointer operands

Teach GlobalISelEmitter to treat used iPTRAny operands as pointer operands

Overloaded intrinsics can use iPTRAny in used/input operands.

The GlobalISelEmitter doesn't know that these are pointers, so it treats them
as scalars. As a result, these intrinsics can't be imported.

This teaches the GlobalISelEmitter to recognize these as pointers rather than
scalars.

Differential Revision: https://reviews.llvm.org/D65756

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369455 91177308-0d34-0410-b5e6-96231b3b80d8