ART: Move code from RA to T9 in Mips64 longjump

Do not use the return address. It should not be clobbered as we
may need it, e.g., for single-frame deopt.

Change-Id: I401d7b0034bc4e210bda231ec78ee31242053b36
diff --git a/runtime/arch/mips64/quick_entrypoints_mips64.S b/runtime/arch/mips64/quick_entrypoints_mips64.S
index 1b50b2e..ce1b2f3 100644
--- a/runtime/arch/mips64/quick_entrypoints_mips64.S
+++ b/runtime/arch/mips64/quick_entrypoints_mips64.S
@@ -431,7 +431,7 @@
     ld      $ra, 248($a0)
     ld      $a0, 32($a0)
     move    $v0, $zero          # clear result registers v0 and v1
-    jalr    $zero, $ra          # do long jump
+    jalr    $zero, $t9          # do long jump (do not use ra, it must not be clobbered)
     move    $v1, $zero
 END art_quick_do_long_jump