Bug 1153601 - MFBT: LZ4: Add support for mips64. r=waldo

--HG--
extra : rebase_source : 32e75777a243e367df3e38480e5827817b280c2c

mfbt/lz4.c

@@ -50,7 +50,8 @@
   || defined(__powerpc64__) || defined(__powerpc64le__) \
   || defined(__ppc64__) || defined(__ppc64le__) \
   || defined(__PPC64__) || defined(__PPC64LE__) \
-  || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) )   /* Detects 64 bits mode */
+  || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) \
+  || (defined(__mips64) && defined(_ABI64)))   /* Detects 64 bits mode */
 #  define LZ4_ARCH64 1
 #else
 #  define LZ4_ARCH64 0