[interpreter] Add ReThrow bytecode for try-finally support.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index dcce26340944b8a52fb5d48a566c4a3d8b09fc52..160ce06f5f89e10d8f19d9ec938aae89c7229e37 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -1751,6 +1751,17 @@ void Interpreter::DoThrow(compiler::InterpreterAssembler* assembler) {
 }
 
 
+// ReThrow
+//
+// Re-throws the exception in the accumulator.
+void Interpreter::DoReThrow(compiler::InterpreterAssembler* assembler) {
+  Node* exception = __ GetAccumulator();
+  __ CallRuntime(Runtime::kReThrow, exception);
+  // We shouldn't ever return from a throw.
+  __ Abort(kUnexpectedReturnFromThrow);
+}
+
+
 // Return
 //
 // Return the value in the accumulator.