More MIPS support

Working through the unimps.

Change-Id: Ie088d2061ca9a77f42ebd75e2936159465deed10
diff --git a/src/compiler/codegen/mips/MipsLIR.h b/src/compiler/codegen/mips/MipsLIR.h
index 67f3131..b2cfdbe 100644
--- a/src/compiler/codegen/mips/MipsLIR.h
+++ b/src/compiler/codegen/mips/MipsLIR.h
@@ -301,7 +301,7 @@
 #define rARG3 r_ARG3
 #define rRET0 r_RESULT0
 #define rRET1 r_RESULT1
-#define rLINK r_RA
+#define rINVOKE_TGT r_V0
 
 /* Shift encodings */
 typedef enum MipsShiftEncodings {