[Interpreter] Introduce IncStub and DecStub.

test/cctest/interpreter/bytecode_expectations/CountOperators.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
 snippet: "
   var a = 1; return ++a;
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 10
+bytecode array length: 9
 bytecodes: [
   B(StackCheck),
   B(LdaSmi), U8(1),
   B(Star), R(0),
-  B(ToNumber),
   B(Inc),
   B(Star), R(0),
   B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]
 
 ---
@@ skipping 18 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; return --a;
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 10
+bytecode array length: 9
 bytecodes: [
   B(StackCheck),
   B(LdaSmi), U8(1),
   B(Star), R(0),
-  B(ToNumber),
   B(Dec),
   B(Star), R(0),
   B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]
 
 ---
@@ skipping 46 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = { val: 1 }; return --a.val;
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 22
+bytecode array length: 21
 bytecodes: [
   B(StackCheck),
   B(CreateObjectLiteral), U8(0), U8(0), U8(5),
   B(Star), R(1),
   B(Star), R(0),
   B(Star), R(1),
   B(LoadIC), R(1), U8(1), U8(1),
-  B(ToNumber),
   B(Dec),
   B(StoreICSloppy), R(1), U8(1), U8(3),
   B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
@@ skipping 29 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var name = 'var'; var a = { val: 1 }; return ++a[name];
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 29
+bytecode array length: 28
 bytecodes: [
   B(StackCheck),
   B(LdaConstant), U8(0),
   B(Star), R(0),
   B(CreateObjectLiteral), U8(1), U8(0), U8(5),
   B(Star), R(2),
   B(Star), R(1),
   B(Star), R(2),
   B(Ldar), R(0),
   B(Star), R(3),
   B(KeyedLoadIC), R(2), U8(1),
-  B(ToNumber),
   B(Inc),
   B(KeyedStoreICSloppy), R(2), R(3), U8(3),
   B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; var b = function() { return a }; return ++a;
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 27
+bytecode array length: 26
 bytecodes: [
   B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
   B(PushContext), R(1),
   B(StackCheck),
   B(LdaSmi), U8(1),
   B(StaContextSlot), R(context), U8(4),
   B(CreateClosure), U8(0), U8(0),
   B(Star), R(0),
   B(LdaContextSlot), R(context), U8(4),
-  B(ToNumber),
   B(Inc),
   B(StaContextSlot), R(context), U8(4),
   B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
@@ skipping 48 matching lines @@
   B(LdaSmi), U8(2),
   B(KeyedStoreICSloppy), R(2), R(3), U8(1),
   B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]