[interpreter] Introduce binary op bytecodes for Smi operand.

test/cctest/interpreter/bytecode_expectations/IfConditions.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: no
 test function name: f
 
@@ skipping 98 matching lines @@
     if (a) {
       a += 1;
     } else {
       return 2;
     }
   };
   f();
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 23
+bytecode array length: 22
 bytecodes: [
   /*   10 E> */ B(StackCheck),
   /*   25 S> */ B(LdaSmi), U8(1),
                 B(Star), R(0),
-  /*   30 S> */ B(JumpIfToBooleanFalse), U8(13),
-  /*   43 S> */ B(LdaSmi), U8(1),
-                B(Add), R(0),
+  /*   30 S> */ B(JumpIfToBooleanFalse), U8(12),
+  /*   43 S> */ B(AddSmi), U8(1), R(0),
                 B(Mov), R(0), R(1),
                 B(Star), R(0),
                 B(Jump), U8(5),
   /*   66 S> */ B(LdaSmi), U8(2),
   /*   80 S> */ B(Return),
                 B(LdaUndefined),
   /*   80 S> */ B(Return),
 ]
 constant pool: [
 ]
@@ skipping 594 matching lines @@
   /*   69 S> */ B(LdaSmi), U8(-20),
   /*   85 S> */ B(Return),
                 B(LdaUndefined),
   /*   85 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]