Ship ES2015 sloppy-mode function hoisting, let, class

test/webkit/webkit.status

Index: test/webkit/webkit.status
diff --git a/test/webkit/webkit.status b/test/webkit/webkit.status
index 6c3f402d63c4184799029bd5550593e7e24fe8fe..971cf4691f97a5ab70b93a866ed6106f922f7219 100644
--- a/test/webkit/webkit.status
+++ b/test/webkit/webkit.status
@@ -35,6 +35,9 @@
   'dfg-inline-arguments-reset-changetype': [PASS, FAIL],
   # TODO(turbofan): We run out of stack earlier on 64-bit for now.
   'fast/js/deep-recursion-test': [PASS, NO_VARIANTS],
+  # This test leads to a SyntaxError from conflicting let declarations
+  # in ES2015
+  'function-declarations-in-switch-statement': [FAIL],
 }],  # ALWAYS
 ['mode == debug', {
   # Too slow in debug mode.