[ruby/prism] More correctly detect SIMD on MSVC

ruby/prism@5fe0448219

Author: kddnewton

prism/defines.h

@@ -280,9 +280,9 @@
  * Platform detection for SIMD / fast-path implementations. At most one of
  * these macros is defined, selecting the best available vectorization strategy.
  */
-#if (defined(__aarch64__) && defined(__ARM_NEON)) || defined(_M_ARM64)
+#if (defined(__aarch64__) && defined(__ARM_NEON)) || (defined(_MSC_VER) && defined(_M_ARM64))
     #define PRISM_HAS_NEON
-#elif (defined(__x86_64__) && defined(__SSSE3__)) || defined(_M_X64)
+#elif (defined(__x86_64__) && defined(__SSSE3__)) || (defined(_MSC_VER) && defined(_M_X64))
     #define PRISM_HAS_SSSE3
 #elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
     #define PRISM_HAS_SWAR