feat: auto-detect intrinsics

Author: TendTo

highs/HConfig.h.bazel.in

@@ -8,8 +8,15 @@
 #define HiGHSRELEASE
 /* #undef HIGHSINT64 */
 /* #undef HIGHS_HAVE_MM_PAUSE */
+#ifdef __has_builtin
+#if __has_builtin(__builtin_clz) && __has_builtin(__builtin_clzll)
 #define HIGHS_HAVE_BUILTIN_CLZ
-/* #undef HIGHS_HAVE_BITSCAN_REVERSE */
+#endif
+#endif
+
+#ifdef _MSC_VER
+#define HIGHS_HAVE_BITSCAN_REVERSE
+#endif
 
 #define HIGHS_GITHASH "bdf95f2e0"
 #define HIGHS_VERSION_MAJOR 1