Fix the types of builtin prototype objects (#3663)

In ES2015 many builtin prototypes are no longer valid instances of their
respective classes. This change updates affected prototypes to be
regular objects as required.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

jerry-core/ecma/base/ecma-globals.h

@@ -940,13 +940,6 @@ typedef struct
                                      *   If regexp, the other flags must be RE_FLAG... */
 } ecma_compiled_code_t;
 
-/**
- * The proper memory size for the RegExp.prototype. We have to align the header's size manually, because
- * in the struct, it is aligned to 8 bytes during the compilation.
- */
-#define ECMA_REGEXP_PROTO_COMPILED_CODE_SIZE \
-  (JERRY_ALIGNUP (sizeof (ecma_compiled_code_t), JMEM_ALIGNMENT) + sizeof (ecma_value_t))
-
 /**
  * Description of bound function objects.
  */