[clang] [clang][x86] Add constexpr support for LZCNT/TZCNT intrinsics (PR #110499)

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


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``````````bash
git-clang-format --diff c0e97c4dfc936ed13ae9696f0615d7e648268bc9 b61842abda168ea02bb6b25598ce6d08757bb4f7 --extensions cpp,h,c -- clang/lib/AST/ExprConstant.cpp clang/lib/Headers/bmiintrin.h clang/lib/Headers/lzcntintrin.h clang/test/CodeGen/X86/bmi-builtins.c clang/test/CodeGen/X86/lzcnt-builtins.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/bmiintrin.h b/clang/lib/Headers/bmiintrin.h
index b0f4436763..634fa39bfa 100644
--- a/clang/lib/Headers/bmiintrin.h
+++ b/clang/lib/Headers/bmiintrin.h
@@ -18,7 +18,8 @@
    instruction behaves as BSF on non-BMI targets, there is code that expects
    to use it as a potentially faster version of BSF. */
 #if defined(__cplusplus) && (__cplusplus >= 201103L)
-#define __RELAXED_FN_ATTRS __attribute__((__always_inline__, __nodebug__)) constexpr
+#define __RELAXED_FN_ATTRS                                                     \
+  __attribute__((__always_inline__, __nodebug__)) constexpr
 #else
 #define __RELAXED_FN_ATTRS __attribute__((__always_inline__, __nodebug__))
 #endif
diff --git a/clang/lib/Headers/lzcntintrin.h b/clang/lib/Headers/lzcntintrin.h
index d746d91d9f..881ca52917 100644
--- a/clang/lib/Headers/lzcntintrin.h
+++ b/clang/lib/Headers/lzcntintrin.h
@@ -16,7 +16,8 @@
 
 /* Define the default attributes for the functions in this file. */
 #if defined(__cplusplus) && (__cplusplus >= 201103L)
-#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt"))) constexpr
+#define __DEFAULT_FN_ATTRS                                                     \
+  __attribute__((__always_inline__, __nodebug__, __target__("lzcnt"))) constexpr
 #else
 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
 #endif

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https://github.com/llvm/llvm-project/pull/110499