gcc: backport patch to fix miscompilation on mips64

gcc: backport patch to fix miscompilation on mips64

Backport a patch to fix miscompilation on mips64.

We've observed strange behaviour of `systemctl status <xxx> on qemumips64.
The output of the command is like `systemctl show <xxx>', which is incorrect.

The problem is due to the miscompilation of gcc for mips64 platform, thus
backporting patch from upstream to fix this problem.

[YOCTO #12266]

(From OE-Core rev: cfa13e5c756849820644d86d1882602649db6a9c)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>