[clang][headers]Remove unnecessary guard of !defined(__SCE__). (#144522)

Sony PlayStation now supports C++20, and we wish to change the default
C++ mode to C++20 sometime in the future. As such, the !defined(__SCE__)
guards are redundant and we want to remove them. This in turn makes the
entire guard lines redundant (always true), so this patch removes them
entirely.

Author: MaggieYingYi

clang/lib/Headers/bmiintrin.h

@@ -161,8 +161,6 @@ _mm_tzcnt_64(unsigned long long __X) {
 
 #undef __RELAXED_FN_ATTRS
 
-#if !defined(__SCE__) || __has_feature(modules) || defined(__BMI__)
-
 /* Define the default attributes for the functions in this file. */
 #if defined(__cplusplus) && (__cplusplus >= 201103L)
 #define __DEFAULT_FN_ATTRS                                                     \
@@ -603,6 +601,4 @@ __blsr_u64(unsigned long long __X) {
 
 #undef __DEFAULT_FN_ATTRS
 
-#endif /* !defined(__SCE__) || __has_feature(modules) || defined(__BMI__) */
-
 #endif /* __BMIINTRIN_H */