[Interpreter] Replace BytecodeRegisterAllocator with a simple bump pointer.

test/cctest/interpreter/bytecode_expectations/ForIn.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 execute: yes
 wrap: yes
 
 ---
 snippet: "
@@ skipping 128 matching lines @@
 ]
 
 ---
 snippet: "
   var x = { 'a': 1, 'b': 2 };
   for (x['a'] in [10, 20, 30]) {
     if (x['a'] == 10) continue;
     if (x['a'] == 20) break;
   }
 "
-frame size: 8
+frame size: 7
 parameter count: 1
 bytecode array length: 83
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(1),
                 B(Mov), R(1), R(0),
   /*   77 S> */ B(CreateArrayLiteral), U8(1), U8(1), U8(9),
                 B(JumpIfUndefined), U8(68),
                 B(JumpIfNull), U8(66),
                 B(ToObject), R(1),
                 B(ForInPrepare), R(1), R(2),
                 B(LdaZero),
                 B(Star), R(5),
   /*   68 S> */ B(ForInContinue), R(5), R(4),
                 B(JumpIfFalse), U8(53),
                 B(ForInNext), R(1), R(5), R(2), U8(12),
                 B(JumpIfUndefined), U8(39),
                 B(Star), R(6),
   /*   67 E> */ B(StaNamedPropertySloppy), R(0), U8(2), U8(10),
   /*   62 E> */ B(StackCheck),
   /*   95 S> */ B(Nop),
-  /*  100 E> */ B(LdrNamedProperty), R(0), U8(2), U8(4), R(7),
+  /*  100 E> */ B(LdrNamedProperty), R(0), U8(2), U8(4), R(6),
                 B(LdaSmi), U8(10),
-  /*  106 E> */ B(TestEqual), R(7), U8(6),
+  /*  106 E> */ B(TestEqual), R(6), U8(6),
                 B(JumpIfFalse), U8(4),
   /*  113 S> */ B(Jump), U8(17),
   /*  125 S> */ B(Nop),
-  /*  130 E> */ B(LdrNamedProperty), R(0), U8(2), U8(7), R(7),
+  /*  130 E> */ B(LdrNamedProperty), R(0), U8(2), U8(7), R(6),
                 B(LdaSmi), U8(20),
-  /*  136 E> */ B(TestEqual), R(7), U8(9),
+  /*  136 E> */ B(TestEqual), R(6), U8(9),
                 B(JumpIfFalse), U8(4),
   /*  143 S> */ B(Jump), U8(9),
                 B(ForInStep), R(5),
                 B(Star), R(5),
                 B(JumpLoop), U8(-53), U8(0),
                 B(LdaUndefined),
   /*  152 S> */ B(Return),
 ]
 constant pool: [
   FIXED_ARRAY_TYPE,
@@ skipping 41 matching lines @@
                 B(LdaUndefined),
   /*   98 S> */ B(Return),
 ]
 constant pool: [
   FIXED_ARRAY_TYPE,
   FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]