Support optimization of named function literals.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index ea2534360e0dddd8479c066383e8b04fa7669fd3..1a9316c55945434e0fb8efcb1a7bb6138c1c6815 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1203,6 +1203,11 @@ LInstruction* LChunkBuilder::DoPushArgument(HPushArgument* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
+  return instr->HasNoUses() ? NULL : DefineAsRegister(new LThisFunction);
+}
+
+
 LInstruction* LChunkBuilder::DoContext(HContext* instr) {
   return instr->HasNoUses() ? NULL : DefineAsRegister(new LContext);
 }