[clang] Create `hlsl` directory before generating headers into it (PR #188618)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Deric C. (Icohedron)

<details>
<summary>Changes</summary>

This PR should fix an issue reported by https://github.com/llvm/llvm-project/pull/187440#issuecomment-4129823619 and https://github.com/llvm/llvm-project/pull/187610#issuecomment-4129976404 where using `clang_generate_header` to generate a header into a directory that did not exist caused an error.

---
Full diff: https://github.com/llvm/llvm-project/pull/188618.diff


1 Files Affected:

- (modified) clang/lib/Headers/CMakeLists.txt (+1) 


``````````diff
diff --git a/clang/lib/Headers/CMakeLists.txt b/clang/lib/Headers/CMakeLists.txt
index c0a2028e81adc..1335074e5d9f6 100644
--- a/clang/lib/Headers/CMakeLists.txt
+++ b/clang/lib/Headers/CMakeLists.txt
@@ -505,6 +505,7 @@ if(RISCV IN_LIST LLVM_TARGETS_TO_BUILD)
 endif()
 
 # Generate HLSL intrinsic overloads
+file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/hlsl")
 clang_generate_header(-gen-hlsl-alias-intrinsics HLSLIntrinsics.td
                       hlsl/hlsl_alias_intrinsics_gen.inc)
 clang_generate_header(-gen-hlsl-inline-intrinsics HLSLIntrinsics.td

``````````

</details>


https://github.com/llvm/llvm-project/pull/188618