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

[Helena Kotas via cfe-commits]

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+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -o - -fsyntax-only %s -verify
+
+struct MySRV {
+  [[hlsl::resource_class(SRV)]] int x;
+};
+
+struct MySampler {
+  [[hlsl::resource_class(Sampler)]] int x;
+};
+
+struct MyUAV {
+  [[hlsl::resource_class(UAV)]] int x;
+};
+
+struct MyCBuffer {
+  [[hlsl::resource_class(CBuffer)]] int x;
+};
+
+// Valid: f is skipped, SRVBuf is bound to t0, UAVBuf is bound to u0
+struct Eg1 {
+  float f;
+  MySRV SRVBuf;
+  MyUAV UAVBuf;
+  };
+Eg1 e1 : register(t0) : register(u0); 
+
+// Valid: f is skipped, SRVBuf is bound to t0, UAVBuf is bound to u0. 
+// UAVBuf2 gets automatically assigned to u1 even though there is no explicit binding for u1.
+struct Eg2 {
+  float f;
+  MySRV SRVBuf;
+  MyUAV UAVBuf;
+  MyUAV UAVBuf2;
+  };
+Eg2 e2 : register(t0) : register(u0); 
+
+// Valid: Bar, the struct within Eg3, has a valid resource that can be bound to t0. 
+struct Eg3 {
+  struct Bar {
+    MyUAV a;
+    };
+    Bar b;
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hekota wrote:

formatting

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