A64: Synchronize with r18256.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 851b7b388f7a39b411ecbb6d6876824fcacc472e..d16bea2497f79d09ce37dd6f81fd1a1dd7ec07a5 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -242,7 +242,7 @@ DEFINE_bool(use_range, true, "use hydrogen range analysis")
 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, true, "use hydrogen escape analysis")
+DEFINE_bool(use_escape_analysis, false, "use hydrogen escape analysis")
 DEFINE_bool(use_allocation_folding, true, "use allocation folding")
 DEFINE_int(max_inlining_levels, 5, "maximum number of inlining levels")
 DEFINE_int(max_inlined_source_size, 600,
@@ -296,7 +296,7 @@ DEFINE_bool(array_index_dehoisting, true,
             "perform array index dehoisting")
 DEFINE_bool(analyze_environment_liveness, true,
             "analyze liveness of environment slots and zap dead values")
-DEFINE_bool(load_elimination, false, "use load elimination")
+DEFINE_bool(load_elimination, true, "use load elimination")
 DEFINE_bool(check_elimination, false, "use check elimination")
 DEFINE_bool(dead_code_elimination, true, "use dead code elimination")
 DEFINE_bool(fold_constants, true, "use constant folding")
@@ -345,7 +345,7 @@ DEFINE_bool(omit_map_checks_for_leaf_maps, true,
             "do not emit check maps for constant values that have a leaf map, "
             "deoptimize the optimized code if the layout of the maps changes.")
 
-DEFINE_bool(new_string_add, false, "enable new string addition")
+DEFINE_bool(new_string_add, true, "enable new string addition")
 
 // Experimental profiler changes.
 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments")