[clang] [clang][x86] Add constexpr support for PDEP/PEXT intrinsics (PR #110535)

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


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``````````bash
git-clang-format --diff 8815328b6bf0f8c5088f6df73ad853a5aba159d9 dd0a2928258eb083799dab03dff3a2f0b8a5f664 --extensions c,h,cpp -- clang/lib/AST/ExprConstant.cpp clang/lib/Headers/bmi2intrin.h clang/test/CodeGen/X86/bmi2-builtins.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/bmi2intrin.h b/clang/lib/Headers/bmi2intrin.h
index 7b2c2f145b..df2447f3c8 100644
--- a/clang/lib/Headers/bmi2intrin.h
+++ b/clang/lib/Headers/bmi2intrin.h
@@ -74,8 +74,7 @@ _bzhi_u32(unsigned int __X, unsigned int __Y)
 ///    The 32-bit mask specifying where to deposit source bits.
 /// \returns The 32-bit result.
 static __inline__ unsigned int __DEFAULT_FN_ATTRS_CONSTEXPR
-_pdep_u32(unsigned int __X, unsigned int __Y)
-{
+_pdep_u32(unsigned int __X, unsigned int __Y) {
   return __builtin_ia32_pdep_si(__X, __Y);
 }
 
@@ -104,8 +103,7 @@ _pdep_u32(unsigned int __X, unsigned int __Y)
 ///    The 32-bit mask specifying which source bits to extract.
 /// \returns The 32-bit result.
 static __inline__ unsigned int __DEFAULT_FN_ATTRS_CONSTEXPR
-_pext_u32(unsigned int __X, unsigned int __Y)
-{
+_pext_u32(unsigned int __X, unsigned int __Y) {
   return __builtin_ia32_pext_si(__X, __Y);
 }
 
@@ -190,8 +188,7 @@ _bzhi_u64(unsigned long long __X, unsigned long long __Y)
 ///    The 64-bit mask specifying where to deposit source bits.
 /// \returns The 64-bit result.
 static __inline__ unsigned long long __DEFAULT_FN_ATTRS_CONSTEXPR
-_pdep_u64(unsigned long long __X, unsigned long long __Y)
-{
+_pdep_u64(unsigned long long __X, unsigned long long __Y) {
   return __builtin_ia32_pdep_di(__X, __Y);
 }
 
@@ -220,8 +217,7 @@ _pdep_u64(unsigned long long __X, unsigned long long __Y)
 ///    The 64-bit mask specifying which source bits to extract.
 /// \returns The 64-bit result.
 static __inline__ unsigned long long __DEFAULT_FN_ATTRS_CONSTEXPR
-_pext_u64(unsigned long long __X, unsigned long long __Y)
-{
+_pext_u64(unsigned long long __X, unsigned long long __Y) {
   return __builtin_ia32_pext_di(__X, __Y);
 }
 

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https://github.com/llvm/llvm-project/pull/110535