Change deoptimize entrypoint to save everything.

And implement FPU register retrieval from stack on x86.

On Nexus 9, AOSP ToT, the boot.oat size reduction is
  prebuilt multi-part boot image:
    - 32-bit boot.oat: -20KiB (-0.03%)
    - 64-bit boot.oat: -45KiB (-0.06%)
  on-device built single boot image:
    - 32-bit boot.oat: -24KiB (-0.04%)
    - 64-bit boot.oat: -36KiB (-0.05%)

Test: Run ART test suite on host and Nexus 9.
Bug: 30212852
Change-Id: I5d98e2a24363136d73dfec6100ab02f8eb101911
diff --git a/runtime/arch/mips/quick_entrypoints_mips.S b/runtime/arch/mips/quick_entrypoints_mips.S
index 3d393f6..4bd1314 100644
--- a/runtime/arch/mips/quick_entrypoints_mips.S
+++ b/runtime/arch/mips/quick_entrypoints_mips.S
@@ -2094,7 +2094,7 @@
      */
     .extern artDeoptimizeFromCompiledCode
 ENTRY art_quick_deoptimize_from_compiled_code
-    SETUP_SAVE_ALL_CALLEE_SAVES_FRAME
+    SETUP_SAVE_EVERYTHING_FRAME
     la       $t9, artDeoptimizeFromCompiledCode
     jalr     $t9                            # artDeoptimizeFromCompiledCode(Thread*)
                                             # Returns caller method's frame size.