mips32/mips64: Fix compiler warnings.

Fix some compiler warnings when compiling Valgrind for no mips arch.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2741 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/host_mips_defs.h b/priv/host_mips_defs.h
index d4c0c8c..3462187 100644
--- a/priv/host_mips_defs.h
+++ b/priv/host_mips_defs.h
@@ -36,12 +36,12 @@
 #include "host_generic_regs.h"  /* HReg */
 
 /* Num registers used for function calls */
-#if defined(VGP_mips64_linux)
-/* a0, a1, a2, a3, a4, a5, a6, a7 */
-#define MIPS_N_REGPARMS 8
-#else
+#if defined(VGP_mips32_linux)
 /* a0, a1, a2, a3 */
 #define MIPS_N_REGPARMS 4
+#else
+/* a0, a1, a2, a3, a4, a5, a6, a7 */
+#define MIPS_N_REGPARMS 8
 #endif
 /* --------- Registers. --------- */