[interpreter] Don't keep postfix result if only visited for effect

test/cctest/interpreter/bytecode_expectations/JumpsRequiringConstantWideOperands.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: number
 execute: yes
 wrap: yes
 
 ---
@@ skipping 309 matching lines @@
   var x = 0.4;
   var x = 0.4;
   var x = 0.4;
   var x = 0.4;
   for (var i = 0; i < 3; i++) {
     if (i == 1) continue;
     if (i == 2) break;
   }
   return 3;
 "
-frame size: 3
+frame size: 2
 parameter count: 1
-bytecode array length: 1409
+bytecode array length: 1407
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   55 S> */ B(LdaConstant), U8(1),
                 B(Star), R(0),
   /*   68 S> */ B(LdaConstant), U8(2),
                 B(Star), R(0),
   /*   81 S> */ B(LdaConstant), U8(3),
                 B(Star), R(0),
@@ skipping 610 matching lines @@
   /* 4059 S> */ B(Wide), B(LdaConstant), U16(309),
                 B(Star), R(0),
   /* 4072 S> */ B(Wide), B(LdaConstant), U16(310),
                 B(Star), R(0),
   /* 4085 S> */ B(Wide), B(LdaConstant), U16(311),
                 B(Star), R(0),
   /* 4103 S> */ B(LdaZero),
                 B(Star), R(1),
   /* 4108 S> */ B(LdaSmi), U8(3),
   /* 4108 E> */ B(TestLessThan), R(1),
-                B(Wide), B(JumpIfFalse), U16(37),
+                B(Wide), B(JumpIfFalse), U16(35),
   /* 4090 E> */ B(StackCheck),
   /* 4122 S> */ B(LdaSmi), U8(1),
   /* 4128 E> */ B(TestEqual), R(1),
                 B(Wide), B(JumpIfFalse), U16(7),
   /* 4134 S> */ B(Wide), B(Jump), U16(15),
   /* 4146 S> */ B(LdaSmi), U8(2),
   /* 4152 E> */ B(TestEqual), R(1),
                 B(Wide), B(JumpIfFalse), U16(7),
-  /* 4158 S> */ B(Wide), B(Jump), U16(12),
+  /* 4158 S> */ B(Wide), B(Jump), U16(10),
   /* 4114 S> */ B(Ldar), R(1),
-                B(ToNumber), R(2),
                 B(Inc),
                 B(Star), R(1),
-                B(Jump), U8(-40),
+                B(Jump), U8(-38),
   /* 4167 S> */ B(LdaSmi), U8(3),
   /* 4177 S> */ B(Return),
 ]
 constant pool: [
   0.1,
   0.1,
   0.1,
   0.1,
   0.1,
   0.1,
@@ skipping 300 matching lines @@
   0.4,
   0.4,
   0.4,
   0.4,
   0.4,
   0.4,
 ]
 handlers: [
 ]