Fix 099-vmdebug and 802-deoptimization art tests for Mips.

There are 2 bugs that are causing these 2 tests to fail the same way.
The first one is we should be using $t9 for function calls so $gp can
be calculated correctly. The second bug is there can't be a gap between
the quick frame and the callee save frame, otherwise the WalkStack()
function will get confused and crash.

Bug: 19003184
Change-Id: I3c545ce18268deb73150fca2a7d7a798540f1cf2
diff --git a/runtime/arch/mips64/quick_entrypoints_mips64.S b/runtime/arch/mips64/quick_entrypoints_mips64.S
index 8cb95f1..697bf00 100644
--- a/runtime/arch/mips64/quick_entrypoints_mips64.S
+++ b/runtime/arch/mips64/quick_entrypoints_mips64.S
@@ -1504,11 +1504,11 @@
     move     $a1, $t0          # pass $sp
     jal      artInstrumentationMethodExitFromCode  # (Thread*, SP, gpr_res, fpr_res)
     move     $a0, rSELF        # pass Thread::Current
-    move     $t0, $v0          # set aside returned link register
+    move     $t9, $v0          # set aside returned link register
     move     $ra, $v1          # set link register for deoptimization
     ld       $v0, 0($sp)       # restore return values
     l.d      $f0, 8($sp)
-    jalr     $zero, $t0        # return
+    jalr     $zero, $t9        # return
     daddiu   $sp, $sp, 16+FRAME_SIZE_REFS_ONLY_CALLEE_SAVE  # 16 bytes of saved values + ref_only callee save frame
     .cfi_adjust_cfa_offset -(16+FRAME_SIZE_REFS_ONLY_CALLEE_SAVE)
 END art_quick_instrumentation_exit