Merge bleeding_edge from version 2.1.3 up to revision 4205...

src/flag-definitions.h

Index: src/flag-definitions.h
===================================================================
--- src/flag-definitions.h	(revision 4205)
+++ src/flag-definitions.h	(working copy)
@@ -152,13 +152,16 @@
             "try to use the speculative optimizing backend for all code")
 DEFINE_bool(trace_bailout, false,
             "print reasons for falling back to using the classic V8 backend")
-DEFINE_bool(safe_int32_compiler, false,
+DEFINE_bool(safe_int32_compiler, true,
             "enable optimized side-effect-free int32 expressions.")
 DEFINE_bool(use_flow_graph, false, "perform flow-graph based optimizations")
 
 // compilation-cache.cc
 DEFINE_bool(compilation_cache, true, "enable compilation cache")
 
+// data-flow.cc
+DEFINE_bool(loop_peeling, false, "Peel off the first iteration of loops.")
+
 // debug.cc
 DEFINE_bool(remote_debugging, false, "enable remote debugging")
 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response")