[builtins] support exception handling in TFJ builtins

src/compiler/raw-machine-assembler.cc

Index: src/compiler/raw-machine-assembler.cc
diff --git a/src/compiler/raw-machine-assembler.cc b/src/compiler/raw-machine-assembler.cc
index 8fd8b5c763059a13e7afcda4eca3fdd135fef286..3bc5db86b67dd526047d887ab55d655d98b501f5 100644
--- a/src/compiler/raw-machine-assembler.cc
+++ b/src/compiler/raw-machine-assembler.cc
@@ -85,6 +85,29 @@ void RawMachineAssembler::Branch(Node* condition, RawMachineLabel* true_val,
   current_block_ = nullptr;
 }
 
+void RawMachineAssembler::BranchIfException(Node* node,
+                                            RawMachineLabel* if_exception) {
+  RawMachineLabel success, call, exception;
+  DCHECK_NE(schedule()->end(), current_block_);
+  DCHECK(!node->op()->HasProperty(Operator::kNoThrow));
+
+  Goto(&call);
+  Bind(&call);
+  schedule()->AddCall(CurrentBlock(), node, Use(&success), Use(&exception));
+  current_block_ = nullptr;
+
+  Bind(&exception);
+  {
+    const Operator* op = common()->IfException();
+    Node* args[] = {node, node};
+    Node* on_exception = MakeNode(op, arraysize(args), args);
+    schedule()->AddNode(CurrentBlock(), on_exception);
+    Goto(if_exception);
+  }
+
+  Bind(&success);
+}
+
 void RawMachineAssembler::Switch(Node* index, RawMachineLabel* default_label,
                                  const int32_t* case_values,
                                  RawMachineLabel** case_labels,