[Interpreter] Introduce IncStub and DecStub.

test/cctest/interpreter/bytecode_expectations/BreakableBlocks.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
@@ skipping 34 matching lines @@
       for (var y = 0; y < 3; ++y) {
         ++sum;
         if (x + y == 12) { break outer; }
       }
     }
   }
   return sum;
 "
 frame size: 5
 parameter count: 1
-bytecode array length: 75
+bytecode array length: 72
 bytecodes: [
   B(StackCheck),
   B(LdaZero),
   B(Star), R(0),
   B(LdaZero),
   B(Star), R(1),
   B(Ldar), R(1),
   B(Star), R(3),
   B(LdaSmi), U8(10),
   B(TestLessThan), R(3),
-  B(JumpIfFalse), U8(57),
+  B(JumpIfFalse), U8(54),
   B(StackCheck),
   B(LdaZero),
   B(Star), R(2),
   B(Ldar), R(2),
   B(Star), R(3),
   B(LdaSmi), U8(3),
   B(TestLessThan), R(3),
-  B(JumpIfFalse), U8(35),
+  B(JumpIfFalse), U8(33),
   B(StackCheck),
   B(Ldar), R(0),
-  B(ToNumber),
   B(Inc),
   B(Star), R(0),
   B(Ldar), R(1),
   B(Star), R(3),
   B(Ldar), R(2),
   B(Add), R(3),
   B(Star), R(4),
   B(LdaSmi), U8(12),
   B(TestEqual), R(4),
   B(JumpIfFalse), U8(4),
-  B(Jump), U8(18),
+  B(Jump), U8(16),
   B(Ldar), R(2),
-  B(ToNumber),
   B(Inc),
   B(Star), R(2),
-  B(Jump), U8(-41),
+  B(Jump), U8(-39),
   B(Ldar), R(1),
-  B(ToNumber),
   B(Inc),
   B(Star), R(1),
-  B(Jump), U8(-63),
+  B(Jump), U8(-60),
   B(Ldar), R(0),
   B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]
 
 ---
 snippet: "
@@ skipping 114 matching lines @@
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]