Remove use of SSE4.2 functions for strstr on i686

The SSE4.2 have been removed from x86_64 by commit 584b18eb.  This patch
fixes the build on i686, which attempts to use the removed files.
Update documentation after dropping PER_THREAD  conditional.

In probes documentation we described what happens when PER_THREAD is
disabled which is now not relevant.
Fix ldbl-128 logl for subnormals (bug 16338).

This patch fixes bug 16338, ldbl-128 logl not handling subnormals
(with consequent inaccuracy for lgammal as well).  The fix is simply
to use __frexpl when determining the exponent, as done already in
log2l and log10l.  Given the lack of testing of small arguments to any
of the log* functions, appropriate tests are added for all of them.

Tested x86_64 and x86 and ulps updated accordingly, and spot tests
also run for mips64 to confirm the ldbl-128 fix.

Note that while this fixes lgammal inaccuracy for small positive
arguments, I suspect that there will still be problems with spurious
underflows in that case.

	* sysdeps/ieee754/ldbl-128/e_logl.c (__ieee754_logl): Use __frexpl
	to determine exponent and adjust argument to have exponent of -1.
	* math/auto-libm-test-in: Add more tests of log, log10, log1p and
	log2.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/x86_64/fpu/libm-test-ulps: Update.
Mark some hypot tests no-test-inline.

As needed on x86.

	* math/auto-libm-test-in: Mark some hypot tests no-test-inline.
	* math/auto-libm-test-out: Regenerated.
[AArch64] Save and restore q0-q7 on entry to dynamic linker.

[BZ #15128] Ensure all argument passing registers are saved and
restored on entry to dynamic linker.
Compile e_sqrt.c with -ffp-contract=off.
Add missing deftp to fix commit 4d84e6addd62bdc256627af.
Update powerpc-nofpu localplt.data for fegetround hidden_proto / hidden_def.

My recent changes that added libm_hidden_proto / libm_hidden_def for
fegetround had the side effect of removing the need for a
localplt.data entry for fegetround for powerpc-nofpu.  This patch
removes that entry.  Tested powerpc-nofpu.

	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/nptl/localplt.data:
	Don't expect fegetround reference in libm.so.
Move tests of jn and yn from libm-test.inc to auto-libm-test-in.

This patch moves tests of jn and yn to auto-libm-test-in, adding the
required support for gen-auto-libm-tests (and adding a missing
assertion there and fixing logic that was broken for functions with
integer arguments).

Tested x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add tests of jn and yn.
	* math/auto-libm-test-out: Regenerated.
	* math/libm-test.inc (jn_test_data): Use AUTO_TESTS_if_f.
	(yn_test_data): Likewise.
	* math/gen-auto-libm-tests.c (func_calc_method): Add value
	mpfr_if_f.
	(func_calc_desc): Add mpfr_if_f union field.
	(FUNC_mpfr_if_f): New macro.
	(test_functions): Add jn and yn.
	(calc_generic_results): Assert type of second input for
	mpfr_ff_f.  Handle mpfr_if_f.
	(output_for_one_input_case): Disable all checking for arguments
	fitting floating-point types in case of an integer argument.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
Add error reporting (via errno) to getauxval().

[BZ 15846] As discussed in the recent thread on my $EXEC_ORIGIN patch
and in BZ 15846, getauxval() presently has no unambiguous way of
reporting an error condition.  It currently returns zero on error, but
this may also be a valid result for some auxv entries.  As there is no
clear invalid result for all current and future auxv entries, this patch
sets errno (following a suggestion in the BZ entry).

This version of the patch also adds documentation and tests for the
value-not-found conditions in getauxval().
Updated NEWS to mention resolution of bug 15846.
Patch [1/4] async-signal safe TLS.

2013-12-18  Andrew Hunter  <ahh@google.com>

	* sysdeps/generic/ldsodefs.h (_dl_mask_all_signals): New prototype.
	(_dl_unmask_signals): Likewise.
	* sysdeps/mach/hurd/dl-sysdep.h (_dl_mask_all_signals): New stub.
	(_dl_unmask_all_signals): Likewise.
	* sysdeps/unix/sysv/linux/dl-sysdep.h (_dl_mask_all_signals): New prototype.
	(_dl_unmask_all_signals): Likewise.
	* sysdeps/unix/sysv/linux/dl-sysdep.c (_dl_mask_all_signals): New function.
	(_dl_unmask_signals): Likewise.
Patch 3/4 of the effort to make TLS access async-signal-safe.
Factor out _dl_clear_dtv.

2013-12-18  Andrew Hunter  <ahh@google.com>

	* elf/Versions (ld): Add _dl_clear_dtv.
	* sysdeps/generic/ldsodefs.h (_dl_clear_dtv): New prototype.
	* elf/dl-tls.c (_dl_clear_dtv): New function.
	* nptl/allocatestack.c (get_cached_stack): Call _dl_clear_dtv.
Patch 2/4 of the effort to make TLS access async-signal-safe.
Add a signal-safe malloc replacement.

2013-12-18  Andrew Hunter  <ahh@google.com>

	* sysdeps/generic/ldsodefs.h (__signal_safe_memalign): New prototype.
	(__signal_safe_malloc, __signal_safe_free): Likewise.
	(__signal_safe_realloc, __signal_safe_calloc): Likewise.
	* elf/dl-misc.c (__signal_safe_allocator_header): New struct.
	(__signal_safe_memalign, __signal_safe_malloc): New function.
	(__signal_safe_free, __signal_safe_realloc): Likewise.
	(__signal_safe_calloc): Likewise.
	* elf/dl-tls.c (allocate_dtv, _dl_clear_dtv): Call signal-safe
	functions.
	(_dl_deallocate_tls, _dl_update_slotinfo): Likewise.
Stop partial menu generation in INSTALL file

The commit d136c6dc resulted in menu text for the "Top" node being added
to the INSTALL file on regeneration.  As the full menu is not displayed
in the plain text file anyway, suppress the menu section completely to
avoid the additional text.

Also regenerate the INSTALL file to commit a small formatting change
introduced in the same commit.