manual: Sort overview listing by manual order.

In the glibc manual we have a "Roadmap to the manual" section at
the end of the "Introduction" chapter.

The introductory text says "Here is an overview of the contents
of the remaining chapters of this manual.", but then proceeds to
list chapters out of order and some chapter are never referenced.

This commit reorders the overview to correctly match the manual
order.

See:
https://sourceware.org/ml/libc-alpha/2014-02/msg00823.html
aarch64: Add setjmp and longjmp SystemTap probes

Add setjmp, longjmp and longjmp_target SystemTap probes.

ChangeLog:

2014-04-22  Will Newton  <will.newton@linaro.org>
	    Venkataramanan Kumar  <venkataramanan.kumar@linaro.org>

	* sysdeps/aarch64/__longjmp.S: Include stap-probe.h.
	(__longjmp): Add longjmp and longjmp_target SystemTap
	probes.
	* sysdeps/aarch64/setjmp.S: Include stap-probe.h.
	(__sigsetjmp): Add setjmp SystemTap probe.
Include atomic.h in sem_wait.c and sem_trywait.c
[AArch64] Use GCC builtins to count leading/tailing zeros.
Fix sigaction conform test failures on sparc.

	* sysdeps/unix/sysv/linux/sparc/bits/sigaction.h
	(struct sigaction): New struct member __glibc_reserved0, change
	type of sa_flags to int.
Use test-skeleton.c in tst-sem3 and tst-sem4
[AArch64] Suppress unnecessary FPSR and FPCR writes.
Replace __int128 with __int128_t in bits/link.h

__int128 was added in GCC 4.6 and __int128_t was added before x86-64
was supported.  This patch replaces __int128 with __int128_t so that
the installed bits/link.h can be used with older GCC.

	* sysdeps/x86/bits/link.h (La_x86_64_regs): Replace __int128
	with __int128_t.
	(La_x86_64_retval): Likewise.