Add phase zone to CompilationInfo and use it in GVN pass.

src/hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7920 matching lines @@
   }
 
   // We don't want to add more than a certain number of nodes from inlining.
   if (inlined_count_ > Min(FLAG_max_inlined_nodes_cumulative,
                            kUnlimitedMaxInlinedNodesCumulative)) {
     TraceInline(target, caller, "cumulative AST node limit reached");
     return false;
   }
 
   // Parse and allocate variables.
-  CompilationInfo target_info(target, zone());
+  CompilationInfo target_info(target, zone(), current_info()->phase_zone());
   Handle<SharedFunctionInfo> target_shared(target->shared());
   if (!Parser::Parse(&target_info) || !Scope::Analyze(&target_info)) {
     if (target_info.isolate()->has_pending_exception()) {
       // Parse or scope error, never optimize this function.
       SetStackOverflow();
       target_shared->DisableOptimization("parse/scope error");
     }
     TraceInline(target, caller, "parse failure");
     return false;
   }
@@ skipping 3632 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal