Revert of MIPS: Optimize load/store with large offset (patchset #1 id:1 of https://codereview.chromium.org/2486283003/ )

Reason for revert:
Breaks CQ trybots now, i.e. https://build.chromium.org/p/tryserver.v8/builders/v8_linux_mipsel_compile_rel/builds/24703/steps/compile%20with%20ninja/logs/stdio

Original issue's description:
> MIPS: Optimize load/store with large offset
>
> Currently, we are using the following sequence for load/store with large offset (offset > 16b):
>
>     lui at, 0x1234
>     ori at, at, 0x5678
>     add at, s0, at
>     lw  a0, 0(at)
>
> This sequence can be optimized in the following way:
>
>     lui at, 0x1234
>     add at, s0, at
>     lw  a0, 0x5678(at)
>
> BUG=

TBR=ivica.bogosavljevic@imgtec.com,miran.karic@imgtec.com,v8-mips-ports@googlegroups.com,dusan.simicic@imgtec.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2500863003
Cr-Commit-Position: refs/heads/master@{#40959}