linux-user: Fix certain argument alignment cases for Mips64

The function that is changed in this patch is supposed to indicate that
there was certain argument rearrangement related to 64-bit arguments on
32-bit platforms. The background on such rearrangements can be found,
for example, in the man page for syscall(2).

However, for 64-bit Mips architectures there is no such rearrangement,
and this patch reflects it.
Signed-off-by: NAleksandar Rikalo <aleksandar.rikalo@imgtec.com>
Signed-off-by: NAleksandar Markovic <aleksandar.markovic@imgtec.com>
Reviewed-by: NLaurent Vivier <laurent@vivier.eu>
Reviewed-by: NLeon Alrae <leon.alrae@imgtec.com>
Acked-by: NRiku Voipio <riku.voipio@linaro.org>
Signed-off-by: NLeon Alrae <leon.alrae@imgtec.com>

linux-user/syscall.c

@@ -658,7 +658,7 @@ static inline int next_free_host_timer(void)
 static inline int regpairs_aligned(void *cpu_env) {
     return ((((CPUARMState *)cpu_env)->eabi) == 1) ;
 }
-#elif defined(TARGET_MIPS)
+#elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32)
 static inline int regpairs_aligned(void *cpu_env) { return 1; }
 #elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
 /* SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs