[clang] [libc][nfc] Steps to allow sharing code between gpu intrin.h headers (PR #131134)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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

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``````````bash
git-clang-format --diff d3255474be3ea24d876eadb6e97a6424c132b23d f0149fdf6d8fcf60b128bef8aacf299e846cc4a8 --extensions h -- clang/lib/Headers/amdgpuintrin.h clang/lib/Headers/gpuintrin.h clang/lib/Headers/nvptxintrin.h
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/gpuintrin.h b/clang/lib/Headers/gpuintrin.h
index 8d300b5b9a..515948b357 100644
--- a/clang/lib/Headers/gpuintrin.h
+++ b/clang/lib/Headers/gpuintrin.h
@@ -38,7 +38,6 @@ _Pragma("push_macro(\"bool\")");
 _DEFAULT_FN_ATTRS static __inline__ uint64_t
 __gpu_read_first_lane_u64(uint64_t __lane_mask, uint64_t __x);
 
-
 #if defined(__NVPTX__)
 #include <nvptxintrin.h>
 #elif defined(__AMDGPU__)
@@ -47,7 +46,6 @@ __gpu_read_first_lane_u64(uint64_t __lane_mask, uint64_t __x);
 #error "This header is only meant to be used on GPU architectures."
 #endif
 
-
 _Pragma("omp begin declare target device_type(nohost)");
 _Pragma("omp begin declare variant match(device = {kind(gpu)})");
 

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https://github.com/llvm/llvm-project/pull/131134