More MIPS support

Working through the unimps.

Change-Id: Ie088d2061ca9a77f42ebd75e2936159465deed10
diff --git a/src/compiler/codegen/mips/ArchFactory.cc b/src/compiler/codegen/mips/ArchFactory.cc
index aaaa50f..963427d 100644
--- a/src/compiler/codegen/mips/ArchFactory.cc
+++ b/src/compiler/codegen/mips/ArchFactory.cc
@@ -145,7 +145,7 @@
         genDebuggerUpdate(cUnit, DEBUGGER_METHOD_EXIT);
     }
     unSpillCoreRegs(cUnit);
-    opReg(cUnit, kOpBx, rLINK);
+    opReg(cUnit, kOpBx, r_RA);
 }
 
 /*