Allocation folding integrated into the GVN phase.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index a0f907db34747c6edc80f329686ad27c4d389ead..4202c0b553ef9633f8c18fb5a4671bf07d72f787 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -215,6 +215,7 @@ DEFINE_bool(use_gvn, true, "use hydrogen global value numbering")
 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, false, "use allocation folding")
 DEFINE_int(max_inlined_source_size, 600,
            "maximum source size in bytes considered for a single inlining")
 DEFINE_int(max_inlined_nodes, 196,
@@ -236,6 +237,7 @@ DEFINE_bool(trace_range, false, "trace range analysis")
 DEFINE_bool(trace_gvn, false, "trace global value numbering")
 DEFINE_bool(trace_representation, false, "trace representation types")
 DEFINE_bool(trace_escape_analysis, false, "trace hydrogen escape analysis")
+DEFINE_bool(trace_allocation_folding, false, "trace allocation folding")
 DEFINE_bool(trace_track_allocation_sites, false,
             "trace the tracking of allocation sites")
 DEFINE_bool(trace_migration, false, "trace object migration")