gdb/record: Add testcases for a few syscalls.

gdb/record: Add testcases for a few syscalls.

gdb/testsuite/ChangeLog:

	* gdb.reverse/fstatat-reverse.c: New test.
	* gdb.reverse/fstatat-reverse.exp: New file.
	* gdb.reverse/getresuid-reverse.c: New test.
	* gdb.reverse/getresuid-reverse.exp: New file.
	* gdb.reverse/pipe-reverse.c: New test.
	* gdb.reverse/pipe-reverse.exp: New file.
	* gdb.reverse/readv-reverse.c: New test.
	* gdb.reverse/readv-reverse.exp: New file.
	* gdb.reverse/recvmsg-reverse.c: New test.
	* gdb.reverse/recvmsg-reverse.exp: New file.
	* gdb.reverse/time-reverse.c: New test.
	* gdb.reverse/time-reverse.exp: New file.
	* gdb.reverse/waitpid-reverse.c: New test.
	* gdb.reverse/waitpid-reverse.exp: New file.