[interpreter] Add a fast path for dynamic local load

test/cctest/interpreter/test-bytecode-generator.cc

Index: test/cctest/interpreter/test-bytecode-generator.cc
diff --git a/test/cctest/interpreter/test-bytecode-generator.cc b/test/cctest/interpreter/test-bytecode-generator.cc
index 9fce98fbd0d4f62da99dbeddddd1d43a342a2fef..c32b7e1906f1332166eabc007eadf6c82b923b10 100644
--- a/test/cctest/interpreter/test-bytecode-generator.cc
+++ b/test/cctest/interpreter/test-bytecode-generator.cc
@@ -1799,14 +1799,24 @@ TEST(Eval) {
 TEST(LookupSlot) {
   InitializedIgnitionHandleScope scope;
   BytecodeExpectationsPrinter printer(CcTest::isolate());
+  printer.set_test_function_name("f");
 
+  // clang-format off

[rmcilroy, 2016/09/16 08:56:55]

Is this necessary? None of the other functions seem to have it.

[Leszek Swirski, 2016/09/16 10:46:54]

Good question, I wouldn't have thought so but then the presubmits failed without
it (and those wouldn't let me keep the spaces between test bodies)

   const char* snippets[] = {
       "eval('var x = 10;'); return x;\n",
 
       "eval('var x = 10;'); return typeof x;\n",
 
       "x = 20; return eval('');\n",
+
+      "var x = 20;\n"
+      "f = function(){\n"
+      "  eval('var x = 10');\n"
+      "  return x;\n"
+      "}\n"
+      "f();\n"
   };
+  // clang-format on
 
   CHECK(CompareTexts(BuildActual(printer, snippets),
                      LoadGolden("LookupSlot.golden")));