Remove funky 2-stage initialization of ParserInfo and an adventurous memset.

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/compiler.h"
 
 #include "src/ast-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 1552 matching lines @@
   bool tracing_on = info()->IsStub()
       ? FLAG_trace_hydrogen_stubs
       : (FLAG_trace_hydrogen &&
          info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter));
   return (tracing_on &&
       base::OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 
 CompilationInfoWithZone::CompilationInfoWithZone(Handle<Script> script)
-    : CompilationInfo((new ParseInfo(&zone_))->InitializeFromScript(script)) {}
+    : CompilationInfo(new ParseInfo(&zone_, script)) {}
 
 
 CompilationInfoWithZone::CompilationInfoWithZone(Handle<JSFunction> function)
-    : CompilationInfo(
-          (new ParseInfo(&zone_))->InitializeFromJSFunction(function)) {}
+    : CompilationInfo(new ParseInfo(&zone_, function)) {}
 
 
 CompilationInfoWithZone::CompilationInfoWithZone(
     Handle<SharedFunctionInfo> shared_info)
-    : CompilationInfo((new ParseInfo(&zone_))
-                          ->InitializeFromSharedFunctionInfo(shared_info)) {}
+    : CompilationInfo(new ParseInfo(&zone_, shared_info)) {}
 
 
 CompilationInfoWithZone::~CompilationInfoWithZone() {
   DisableFutureOptimization();
   RollbackDependencies();
   delete parse_info_;
   parse_info_ = nullptr;
 }
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 } }  // namespace v8::internal