[Interpreter] Replace BytecodeRegisterAllocator with a simple bump pointer.

test/cctest/interpreter/bytecode_expectations/ClassAndSuperClass.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 execute: yes
 wrap: no
 test function name: test
 
 ---
@@ skipping 17 matching lines @@
                 B(Mov), R(closure), R(0),
   /*   99 E> */ B(StackCheck),
   /*  104 S> */ B(LdaConstant), U8(0),
   /*  111 E> */ B(LdrKeyedProperty), R(closure), U8(4), R(4),
                 B(LdaConstant), U8(1),
                 B(Star), R(5),
                 B(Mov), R(this), R(3),
                 B(CallRuntime), U16(Runtime::kLoadFromSuper), R(3), U8(3),
                 B(Star), R(1),
   /*  117 E> */ B(Call), R(1), R(this), U8(1), U8(2),
-                B(Star), R(3),
-                B(AddSmi), U8(1), R(3), U8(8),
+                B(Star), R(1),
+                B(AddSmi), U8(1), R(1), U8(8),
   /*  131 S> */ B(Return),
 ]
 constant pool: [
   SYMBOL_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["method"],
 ]
 handlers: [
 ]
 
 ---
@@ skipping 145 matching lines @@
                 B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
   /*  139 S> */ B(Return),
 ]
 constant pool: [
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["this"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["y_"],
 ]
 handlers: [
 ]