[interpreter] Add a register operand to ToNumber

test/cctest/interpreter/bytecode_expectations/GlobalCountOperators.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: string
 execute: yes
 wrap: no
 test function name: f
 
@@ skipping 20 matching lines @@
 ]
 
 ---
 snippet: "
   var global = 1;
   function f() { return global--; }
   f();
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 13
+bytecode array length: 12
 bytecodes: [
   /*   26 E> */ B(StackCheck),
   /*   31 S> */ B(LdaGlobal), U8(1),
-                B(ToNumber),
-                B(Star), R(0),
+                B(ToNumber), R(0),
                 B(Dec),
   /*   44 E> */ B(StaGlobalSloppy), U8(0), U8(3),
                 B(Ldar), R(0),
   /*   48 S> */ B(Return),
 ]
 constant pool: [
   "global",
 ]
 handlers: [
 ]
@@ skipping 21 matching lines @@
 ]
 
 ---
 snippet: "
   unallocated = 1;
   function f() { return unallocated++; }
   f();
 "
 frame size: 1
 parameter count: 1
-bytecode array length: 13
+bytecode array length: 12
 bytecodes: [
   /*   27 E> */ B(StackCheck),
   /*   32 S> */ B(LdaGlobal), U8(1),
-                B(ToNumber),
-                B(Star), R(0),
+                B(ToNumber), R(0),
                 B(Inc),
   /*   50 E> */ B(StaGlobalSloppy), U8(0), U8(3),
                 B(Ldar), R(0),
   /*   54 S> */ B(Return),
 ]
 constant pool: [
   "unallocated",
 ]
 handlers: [
 ]