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

test/cctest/compiler/test-loop-assignment-analysis.cc

 // Copyright 2014 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/compiler/ast-loop-assignment-analyzer.h"
 #include "src/parser.h"
 #include "src/rewriter.h"
 #include "src/scopes.h"
 #include "test/cctest/cctest.h"
 
@@ skipping 11 matching lines @@
       : function(Handle<JSFunction>::null()), result(NULL) {
     ScopedVector<char> program(kBufferSize);
     SNPrintF(program, "function f(a,b,c) { %s; } f;", body);
     v8::Local<v8::Value> v = CompileRun(program.start());
     Handle<Object> obj = v8::Utils::OpenHandle(*v);
     function = Handle<JSFunction>::cast(obj);
   }
 
   void CheckLoopAssignedCount(int expected, const char* var_name) {
     // TODO(titzer): don't scope analyze every single time.
-    ParseInfo parse_info(main_zone());
-    parse_info.InitializeFromJSFunction(function);
+    ParseInfo parse_info(main_zone(), function);
     CompilationInfo info(&parse_info);
 
     CHECK(Parser::ParseStatic(&parse_info));
     CHECK(Rewriter::Rewrite(&parse_info));
     CHECK(Scope::Analyze(&parse_info));
 
     Scope* scope = info.function()->scope();
     AstValueFactory* factory = parse_info.ast_value_factory();
     CHECK(scope);
 
@@ skipping 243 matching lines @@
       "    while (1) z++;"
       "  }"
       "}"
       "w;");
 
   f.CheckLoopAssignedCount(1, "x");
   f.CheckLoopAssignedCount(3, "y");
   f.CheckLoopAssignedCount(5, "z");
   f.CheckLoopAssignedCount(0, "w");
 }