[clang] [HLSL] Add testing for space parameter on global constants (PR #106782)

[Damyan Pepper via cfe-commits]

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+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -o - -fsyntax-only %s -verify
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damyanp wrote:

This file seems to now mostly be testing non-error cases of specifying a space for registers.  I think it'd probably be better to just merge these into the other tests we have.

Specifying a register space isn't some bit special thing, it's part of the normal flow we should consider when validating that, say, `u` type registers work with particular types of resource.

https://github.com/llvm/llvm-project/pull/106782