Change mips64 lwu to ld for loading caller ArtMethod*

Bug: 21815962
Change-Id: Id589f4a49349d817d3dc9128109048292fe0ed33
diff --git a/runtime/arch/mips64/quick_entrypoints_mips64.S b/runtime/arch/mips64/quick_entrypoints_mips64.S
index bdd8a30..7f68c6f 100644
--- a/runtime/arch/mips64/quick_entrypoints_mips64.S
+++ b/runtime/arch/mips64/quick_entrypoints_mips64.S
@@ -529,7 +529,7 @@
     .extern \cxx_name
 ENTRY \c_name
     SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME  # save callee saves in case allocation triggers GC
-    lwu   $a2, FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE($sp)  # pass caller Method*
+    ld    $a2, FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE($sp)  # pass caller Method*
     move  $a3, rSELF                       # pass Thread::Current
     jal   \cxx_name                        # (method_idx, this, caller, Thread*, $sp)
     move  $a4, $sp                         # pass $sp