[clang] Implement resource binding type prefix mismatch diagnostic infrastructure (PR #97103)

[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
+
+// This test validates the diagnostics that are emitted when a variable with a "resource" type
+// is bound to a register using the register annotation
+
+// expected-error at +1  {{binding type 'b' only applies to constant buffer resources}}
+RWBuffer<int> a : register(b2, space1);
+
+// expected-error at +1  {{binding type 't' only applies to srv resources}}
+RWBuffer<int> b : register(t2, space1);
+
+// NOT YET IMPLEMENTED : {{invalid register name prefix 'u' for register type 'Texture1D' (expected 't')}}
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damyanp wrote:

All of these NOT YET IMPLEMENTED we should be able to implement and test now that we can spell resource_class.

I'm not convinced that the errors listed here match the current design though?  Would this one for example now be "binding type 'u' only applies to uav resources"?

https://github.com/llvm/llvm-project/pull/97103