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

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 91cfe4df8fa4730c86caa3a5cd7bb958d839ad02..12b474451fa69a77ce83821bc8fbc0eb145a027a 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -960,6 +960,13 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::Throw() {
 }
 
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::ReThrow() {
+  Output(Bytecode::kReThrow);
+  exit_seen_in_block_ = true;
+  return *this;
+}
+
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::Return() {
   Output(Bytecode::kReturn);
   exit_seen_in_block_ = true;