[Interpreter] Fixes a bug when popping context to correct level on break/continue.

test/cctest/interpreter/bytecode_expectations/ConstVariableContextSlot.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
@@ skipping 21 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   const x = 10; function f1() {return x;} return x;
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 37
+bytecode array length: 39
 bytecodes: [
   B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
   B(PushContext), R(1),
   B(LdaTheHole),
   B(StaContextSlot), R(context), U8(4),
   B(CreateClosure), U8(0), U8(0),
   B(Star), R(0),
   B(StackCheck),
   B(LdaSmi8), U8(10),
   B(StaContextSlot), R(context), U8(4),
   B(LdaContextSlot), R(context), U8(4),
   B(JumpIfNotHole), U8(11),
   B(LdaConstant), U8(1),
   B(Star), R(2),
   B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
+  B(PopContext), R(1),
   B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
@@ skipping 62 matching lines @@
   B(LdaUndefined),
   B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]