x86-64: Update gcc.target/i386/apx-ndd.c

Fix the following issues:

1. Replace long with int64_t to support x32.
2. Replace \\(%rdi\\) with \\(%(?:r|e)di\\) for memory operand since x32
uses (%edi).
3. Replace %(?:|r|e)al with %al in negb scan.

	* gcc.target/i386/apx-ndd.c: Updated.