Add flags for write barrier elimination and local allocation folding.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 393e2a65652bee86859249ff887c8cbf68cda997..72a617dc9d4fecd1c96699ab3054d3efa71e5c96 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -251,6 +251,8 @@ DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
 DEFINE_bool(use_inlining, true, "use function inlining")
 DEFINE_bool(use_escape_analysis, false, "use hydrogen escape analysis")
 DEFINE_bool(use_allocation_folding, true, "use allocation folding")
+DEFINE_bool(use_local_allocation_folding, false, "only fold in basic blocks")
+DEFINE_bool(use_write_barrier_elimination, true, "eliminate write barriers")

[Hannes Payer (out of office), 2014/02/14 12:02:52]

We are still eliminating write barriers when this flag is turned off. We should
relate it to the allocate case.

[Michael Starzinger, 2014/02/14 14:37:34]

Done. I adapted the description accordingly and made if more expressive.
Couldn't come up with a better name for the flag itself though.

 DEFINE_int(max_inlining_levels, 5, "maximum number of inlining levels")
 DEFINE_int(max_inlined_source_size, 600,
            "maximum source size in bytes considered for a single inlining")