Another step towards a Mips target

Updating the MIPS target to use the now common codegen routines.
Still much to do, but the general structure is sufficient to allow
work to begin on the other target.

Change-Id: I0d288fdfb59c8e76fad73185fdd56b345e87b604
diff --git a/src/compiler/codegen/CompilerCodegen.h b/src/compiler/codegen/CompilerCodegen.h
index ae85bb3..26dad82 100644
--- a/src/compiler/codegen/CompilerCodegen.h
+++ b/src/compiler/codegen/CompilerCodegen.h
@@ -35,6 +35,9 @@
 void oatCodegenDump(CompilationUnit* cUnit);
 void oatDumpPromotionMap(CompilationUnit* cUnit);
 void oatDumpFullPromotionMap(CompilationUnit* cUnit);
+std::string buildInsnString(const char* fmt, LIR* lir,
+                            unsigned char* baseAddr);
+
 
 /* Implemented in codegen/<target>/Ralloc.c */
 void oatSimpleRegAlloc(CompilationUnit* cUnit);