[clang] [HLSL] Add ByteAddressBuffer definition to HLSLExternalSemaSource #113477 (PR #116699)

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+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -x hlsl -ast-dump -DEMPTY %s | FileCheck -check-prefix=EMPTY %s
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -x hlsl -ast-dump %s | FileCheck %s
+
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joaosaffran wrote:

I refactor the test a little to make it more generic. However, I feel more comfortable making this change once we have more buffer classes, this way I will have more code to create patterns of. 

https://github.com/llvm/llvm-project/pull/116699