Preliminary changes to allow mips target to build.

It compiles, but it doesn't work yet.

Change-Id: I2973a03bd956d8d398b9cfd1047e66fbf3ff439c
diff --git a/src/oat/runtime/support_proxy.cc b/src/oat/runtime/support_proxy.cc
index 972779d..c224484 100644
--- a/src/oat/runtime/support_proxy.cc
+++ b/src/oat/runtime/support_proxy.cc
@@ -28,6 +28,10 @@
 #define SP_OFFSET_IN_BYTES 12
 #define FRAME_SIZE_IN_BYTES 48u
 #define ARG2_OFFSET_IN_WORDS 11 // offset to 3rd arg; skip callee saves, LR, Method* and out arg spills for OUT0 to OUT2
+#elif defined(__mips__)
+#define SP_OFFSET_IN_BYTES 8
+#define FRAME_SIZE_IN_BYTES 32u
+#define ARG2_OFFSET_IN_WORDS 8 // offset to 3rd arg; skip callee saves, LR, Method* and out arg spills for OUT0 to OUT2
 #elif defined(__i386__)
 #define SP_OFFSET_IN_BYTES 8
 #define FRAME_SIZE_IN_BYTES 32u