[X86] Use __builtin_bit_cast _mm_extract_ps instead of type punning through a union. NFC

Author: topperc

clang/lib/Headers/smmintrin.h

@@ -865,10 +865,8 @@ _mm_max_epu32 (__m128i __V1, __m128i __V2)
 ///    10: Bits [95:64] of parameter \a X are returned. \n
 ///    11: Bits [127:96] of parameter \a X are returned.
 /// \returns A 32-bit integer containing the extracted 32 bits of float data.
-#define _mm_extract_ps(X, N) (__extension__                      \
-  ({ union { int __i; float __f; } __t;  \
-     __t.__f = __builtin_ia32_vec_ext_v4sf((__v4sf)(__m128)(X), (int)(N)); \
-     __t.__i;}))
+#define _mm_extract_ps(X, N) \
+  __builtin_bit_cast(int, __builtin_ia32_vec_ext_v4sf((__v4sf)(__m128)(X), (int)(N)))
 
 /* Miscellaneous insert and extract macros.  */
 /* Extract a single-precision float from X at index N into D.  */