MIPS: Fix art_quick_instrumentation_entry/exit

This is a follow-up change for
Iab229353fae23c2ea27c2b698c831627a9f861b1.

This fixes following tests for both MIPS32 and MIPS64:
  * 099-vmdebug
  * 304-method-tracing
  * 545-tracing-and-jit
  * 570-checker-osr
  * 597-deopt-new-string
  * 802-deoptimization
  * 988-method-trace
  * 989-method-trace-throw

Test: ./testrunner.py --optimizing --target in QEMU (MIPS64R6)
Test: ./testrunner.py --optimizing --target on CI20 (MIPS32R2)

Change-Id: I064588283b65971f07150eb30a1fcf90c765eb40