Enable stub generation using Hydrogen/Lithium (again)

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 25157be2eb42524c9901b4dbb8050b6cc224bb12..ccaf290d9eb47818782accc6707b08dd796f9b05 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -1375,6 +1375,11 @@ ExternalReference ExternalReference::page_flags(Page* page) {
 }
 
 
+ExternalReference ExternalReference::ForDeoptEntry(Address entry) {
+  return ExternalReference(entry);
+}
+
+
 // Helper function to compute x^y, where y is known to be an
 // integer. Uses binary decomposition to limit the number of
 // multiplications; see the discussion in "Hacker's Delight" by Henry