Ensure getConstString uses slow path for non-image compilation

Change-Id: If7f0eeb277e1ddc9028c90d4b8fab1621f1ea77e
diff --git a/src/compiler/CompilerIR.h b/src/compiler/CompilerIR.h
index 8dcf56b..dac63cf 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -186,7 +186,8 @@
     int numInsts;
     int numBlocks;
     GrowableList blockList;
-    const Method *method;
+    const Compiler* compiler;
+    const Method* method;
     LIR* firstLIRInsn;
     LIR* lastLIRInsn;
     LIR* literalList;                   // Constants