[clang] Add support for the cl_intel_subgroup_buffer_prefetch (PR #170532)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h -- clang/lib/Headers/opencl-c.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/opencl-c.h b/clang/lib/Headers/opencl-c.h
index 2ea48f276..b48851c36 100644
--- a/clang/lib/Headers/opencl-c.h
+++ b/clang/lib/Headers/opencl-c.h
@@ -17673,7 +17673,8 @@ void __ovld __conv intel_sub_group_block_prefetch_us(const __global ushort *p);
 void __ovld __conv intel_sub_group_block_prefetch_us2(const __global ushort *p);
 void __ovld __conv intel_sub_group_block_prefetch_us4(const __global ushort *p);
 void __ovld __conv intel_sub_group_block_prefetch_us8(const __global ushort *p);
-void __ovld __conv intel_sub_group_block_prefetch_us16(const __global ushort *p);
+void __ovld __conv
+intel_sub_group_block_prefetch_us16(const __global ushort *p);
 #endif // defined(cl_intel_subgroup_buffer_prefetch)
 #endif // cl_intel_subgroups_short
 

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https://github.com/llvm/llvm-project/pull/170532