Speedup access to global_proxy.* attributes/accessors.

Using a global proxy (e.g. 'window.f', 'w.f' or 'this.f') is considerably slower than evaluating just 'f'. This CL aims to perform the necessary checks at compile time and inline the accesses.

This is a follow-on CL to crrev.com/2369933005:
- The initial upload is crrev.com/2369933005 + a rebase.
- The remaining issues are the fixes requested by the reviewers on that CL.

BUG=chromium:634276, chromium:654716

Committed: https://crrev.com/8f43d748272536117008aa6a1b53ea52126261c1
Review-Url: https://codereview.chromium.org/2403003002
Cr-Original-Commit-Position: refs/heads/master@{#40153}
Cr-Commit-Position: refs/heads/master@{#40365}

src/crankshaft/hydrogen.h

@@ -2342,14 +2342,16 @@ class HOptimizedGraphBuilder : public HGraphBuilder,
 #undef DECLARE_VISIT
 
  private:
-  // Helpers for flow graph construction.
-  enum GlobalPropertyAccess {
-    kUseCell,
-    kUseGeneric
-  };
-  GlobalPropertyAccess LookupGlobalProperty(Variable* var, LookupIterator* it,
+  bool CanInlineGlobalPropertyAccess(Variable* var, LookupIterator* it,
+                                     PropertyAccessType access_type);
+
+  bool CanInlineGlobalPropertyAccess(LookupIterator* it,
                                      PropertyAccessType access_type);
 
+  void InlineGlobalPropertyLoad(LookupIterator* it, BailoutId ast_id);
+  HInstruction* InlineGlobalPropertyStore(LookupIterator* it, HValue* value,
+                                          BailoutId ast_id);
+
   void EnsureArgumentsArePushedForAccess();
   bool TryArgumentsAccess(Property* expr);