[mips] Reduce number of instructions used for loading a global symbol's value

Now `lw/sw $reg, sym+offset` pseudo instructions for global symbol `sym`
are lowering into the following three instructions.
```
lw     $reg, %got(symbol)($gp)
addiu  $reg, $reg, offset
lw/sw  $reg, 0($reg)
```

It's possible to reduce the number of instructions by taking the offset
in account in the final `lw/sw` command. This patch implements that
optimization.
```
lw     $reg, %got(symbol)($gp)
lw/sw  $reg, offset($reg)
```

Differential Revision: https://reviews.llvm.org/D66553

llvm-svn: 369756