Fix quick fly2iceland (code_size = 0) bug.

Change-Id: I8c38d4dfb06885834c65a0d85673d9675cc504fb
diff --git a/src/compiler/Frontend.cc b/src/compiler/Frontend.cc
index ab940af..2484101 100644
--- a/src/compiler/Frontend.cc
+++ b/src/compiler/Frontend.cc
@@ -821,6 +821,7 @@
   cUnit->context = context;
   cUnit->intrinsic_helper = intrinsic_helper;
   cUnit->irb = irb;
+  cUnit->gbcOnly = gbcOnly;
   if (cUnit->instructionSet == kThumb2) {
     // TODO: remove this once x86 is tested
     cUnit->genBitcode = true;