Improve x86 inline assembler

- added cc annotation to inline asm that clobbers the condition
  flags
- remove hardcoded constants (IS_LONG,IS_DOUBLE)
- remove hardcoded offsets (zval->value, zval->type)
Low-level ARM optimizations

- added ARM versions of zend_mm_high_bit()/zend_mm_low_bit()
- improved safe_address()