Portable path example interface

Here's an example of a simple interface to the common front-end for
use by the portable path.  Untested.

Change-Id: Id444aaa1bc8e2e26b6b449e78be32dd053faa4df
diff --git a/src/compiler/CompilerIR.h b/src/compiler/CompilerIR.h
index 87dbd09..d63b295 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -424,6 +424,7 @@
       checkstats(NULL),
 #if defined(ART_USE_QUICK_COMPILER)
       genBitcode(false),
+      gbcOnly(false),
       context(NULL),
       module(NULL),
       func(NULL),
@@ -596,6 +597,7 @@
   Checkstats* checkstats;
 #if defined(ART_USE_QUICK_COMPILER)
   bool genBitcode;
+  bool gbcOnly;
   llvm::LLVMContext* context;
   llvm::Module* module;
   llvm::Function* func;