First stab at try-catch and try-finally in TurboFan.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 797ddf9671cd2dbd556e19b3ebbc24075a9393db..c6f9011694edfe26fb7c5429a82b9f14043874f8 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -104,7 +104,6 @@ REPLACE_COMPARE_IC_CALL(JSGreaterThanOrEqual, Token::GTE)
 REPLACE_RUNTIME_CALL(JSTypeOf, Runtime::kTypeof)
 REPLACE_RUNTIME_CALL(JSCreate, Runtime::kAbort)
 REPLACE_RUNTIME_CALL(JSCreateFunctionContext, Runtime::kNewFunctionContext)
-REPLACE_RUNTIME_CALL(JSCreateCatchContext, Runtime::kPushCatchContext)
 REPLACE_RUNTIME_CALL(JSCreateWithContext, Runtime::kPushWithContext)
 REPLACE_RUNTIME_CALL(JSCreateBlockContext, Runtime::kPushBlockContext)
 REPLACE_RUNTIME_CALL(JSCreateModuleContext, Runtime::kPushModuleContext)
@@ -364,6 +363,13 @@ void JSGenericLowering::LowerJSStoreContext(Node* node) {
 }
 
 
+void JSGenericLowering::LowerJSCreateCatchContext(Node* node) {
+  Unique<String> name = OpParameter<Unique<String>>(node);
+  PatchInsertInput(node, 0, jsgraph()->HeapConstant(name));
+  ReplaceWithRuntimeCall(node, Runtime::kPushCatchContext);
+}
+
+
 void JSGenericLowering::LowerJSCallConstruct(Node* node) {
   int arity = OpParameter<int>(node);
   CallConstructStub stub(isolate(), NO_CALL_CONSTRUCTOR_FLAGS);