Don't create ScopeInfo if there already is one.

R=mstarzinger@chromium.org, rmcilroy@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2263493002
Cr-Commit-Position: refs/heads/master@{#38741}

src/compiler.cc

@@ -515,8 +515,7 @@ 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);
 }