[interpreter] Introduce binary op bytecodes for Smi operand.

test/cctest/interpreter/bytecode_expectations/Switch.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: number
 execute: yes
 wrap: yes
 
 ---
@@ skipping 463 matching lines @@
    case 1: 
      switch(a + 1) {
         case 2 : a = 1; break;
         default : a = 2; break;
      }  // fall-through
    case 2: a = 3;
   }
 "
 frame size: 5
 parameter count: 1
-bytecode array length: 59
+bytecode array length: 58
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
                 B(Star), R(2),
                 B(Star), R(0),
   /*   45 S> */ B(LdaSmi), U8(1),
                 B(TestEqualStrict), R(0),
                 B(Mov), R(0), R(3),
                 B(JumpIfToBooleanTrue), U8(10),
                 B(LdaSmi), U8(2),
                 B(TestEqualStrict), R(3),
-                B(JumpIfTrue), U8(33),
-                B(Jump), U8(35),
-                B(LdaSmi), U8(1),
-  /*   77 E> */ B(Add), R(2),
+                B(JumpIfTrue), U8(32),
+                B(Jump), U8(34),
+  /*   77 E> */ B(AddSmi), U8(1), R(2),
                 B(Star), R(1),
   /*   70 S> */ B(LdaSmi), U8(2),
                 B(TestEqualStrict), R(1),
                 B(Mov), R(1), R(4),
                 B(JumpIfToBooleanTrue), U8(4),
                 B(Jump), U8(8),
   /*  101 S> */ B(LdaSmi), U8(1),
                 B(Star), R(2),
   /*  108 S> */ B(Jump), U8(8),
   /*  131 S> */ B(LdaSmi), U8(2),
                 B(Star), R(2),
   /*  138 S> */ B(Jump), U8(2),
   /*  176 S> */ B(LdaSmi), U8(3),
                 B(Star), R(2),
                 B(LdaUndefined),
   /*  185 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]