More MIPS support

Working through the unimps.

Change-Id: Ie088d2061ca9a77f42ebd75e2936159465deed10
diff --git a/src/compiler/codegen/arm/ArmLIR.h b/src/compiler/codegen/arm/ArmLIR.h
index cafc993..db2d6e8 100644
--- a/src/compiler/codegen/arm/ArmLIR.h
+++ b/src/compiler/codegen/arm/ArmLIR.h
@@ -251,7 +251,7 @@
 #define rARG3 r3
 #define rRET0 r0
 #define rRET1 r1
-#define rLINK rLR
+#define rINVOKE_TGT rLR
 
 /* Shift encodings */
 typedef enum ArmShiftEncodings {