Don't create ScopeInfo if there already is one.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 02687312e03b8e8f5b63caab8d805b479219a3e9..d22e1f35e6c48f049bc623272b2cfe7ab5658cf2 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -514,8 +514,7 @@ bool CompileUnoptimizedCode(CompilationInfo* info) {
 
 void InstallSharedScopeInfo(CompilationInfo* info,
                             Handle<SharedFunctionInfo> shared) {
-  Handle<ScopeInfo> scope_info =
-      ScopeInfo::Create(info->isolate(), info->zone(), info->scope());
+  Handle<ScopeInfo> scope_info = info->scope()->GetScopeInfo(info->isolate());
   shared->set_scope_info(*scope_info);
 }