Merge pull request #33 from glaubitz/sparc64

Use platform-independent preprocessor macros for sparc64

Author: alexcrichton

lib/builtins/int_lib.h

@@ -89,7 +89,7 @@
  * Presumably it's any version of GCC, and targeting an arch that
  * does not have dedicated bit counting instructions.
  */
-#if (defined(__sparc64__) || defined(__sparcv9) || defined(__mips_n64) || defined(__mips_o64) || defined(__riscv__) \
+#if ((defined(__sparc__) || defined(__arch64__)) || defined(__mips_n64) || defined(__mips_o64) || defined(__riscv__) \
 		|| (defined(_MIPS_SIM) && ((_MIPS_SIM == _ABI64) || (_MIPS_SIM == _ABIO64))))
 si_int __clzsi2(si_int);
 si_int __ctzsi2(si_int);