Preliminary lowering of typed array loads in TF.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 82c0b874c4f1229d9e9af45d94a7a4e02f918384..00cd0f40b3ae8bc8d09f4ee417848423ce684466 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -81,7 +81,8 @@ class CompilationInfo {
     kParseRestriction = 1 << 14,
     kSerializing = 1 << 15,
     kContextSpecializing = 1 << 16,
-    kInliningEnabled = 1 << 17
+    kInliningEnabled = 1 << 17,
+    kTypingEnabled = 1 << 18
   };
 
   CompilationInfo(Handle<JSFunction> closure, Zone* zone);
@@ -191,6 +192,10 @@ class CompilationInfo {
 
   bool is_inlining_enabled() const { return GetFlag(kInliningEnabled); }
 
+  void MarkAsTypingEnabled() { SetFlag(kTypingEnabled); }
+
+  bool is_typing_enabled() const { return GetFlag(kTypingEnabled); }
+
   bool IsCodePreAgingActive() const {
     return FLAG_optimize_for_size && FLAG_age_code && !will_serialize() &&
            !is_debug();