Fix building when SPIRV is disabled

[damyanp]

Fixes build break introduced by ec9d97a (#8365), which referenced hlsl::GetVKBufferPointerAlignment and m_vkBufferPointerTemplateDecl unconditionally.

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff ec9d97a98b083c757b2832da50984e72f4189f3b 5c6417ad9cf60ce46d8144c792e7d91a93f3914c -- tools/clang/lib/Sema/SemaHLSL.cpp

View the diff from clang-format here.

diff --git a/tools/clang/lib/Sema/SemaHLSL.cpp b/tools/clang/lib/Sema/SemaHLSL.cpp
index e953758b..7df68f5a 100644
--- a/tools/clang/lib/Sema/SemaHLSL.cpp
+++ b/tools/clang/lib/Sema/SemaHLSL.cpp
@@ -7484,7 +7484,8 @@ bool HLSLExternalSource::MatchArguments(
             TemplateName(m_vkBufferPointerTemplateDecl), TemplateArgs, 2,
             m_context->getTypeDeclType(Spec));
 #else
-        // The IOP_Vk* opcodes are only reachable when ENABLE_SPIRV_CODEGEN is defined.
+        // The IOP_Vk* opcodes are only reachable when ENABLE_SPIRV_CODEGEN is
+        // defined.
         llvm_unreachable("vk:: pointer cast intrinsics require SPIR-V codegen");
 #endif // ENABLE_SPIRV_CODEGEN
       } else {

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