Remove trailing whitespace from mach/*.sub.
Fix symbol definitions for __clock_* functions

__clock_gettime and other __clock_* functions could result in an extra
PLT reference within libc.so if it actually gets used.  None of the
code currently uses them, which is why this probably went unnoticed.
Fix-trailing-whitespaces-in-libidn.
Update Chinese (traditional) translation from translation project
Fix handling of netgroup cache in nscd
Begin porting string performance tests to benchtests

This is the initial support for string function performance tests,
along with copying tests for memcpy and memcpy-ifunc as proof of
concept.  The string function benchmarks perform operations at
different alignments and for different sizes and compare performance
between plain operations and the optimized string operations.  Due to
this their output is incompatible with the function benchmarks where
we're interested in fastest time, throughput, etc.

In future, the correctness checks in the benchmark tests can be
removed.  Same goes for the performance measurements in the
string/test-*.
Copy over string performance tests into benchtests

Copy over already existing string performance tests into benchtests.
Bits not related to performance measurements have been omitted.
Remove performance-related bits from string tests
Fix indentation and add copyright header to time.h
Update BIG5-HKSCS charmap to HKSCS-2008
PowerPC: Merge ports/ dl-procinfo.[ch] with base.
PowerPC: Remove redundant ports/sysdeps/powerpc/dl-procinfo.[ch].
Port remaining string benchmarks

There were a few more string benchmarks (strcpy_chk and stpcpy_check)
in the debug directory that needed to be ported over.
Add exception information to math-tests.h and use it in libm-test.inc.
Convert iso-639.def to utf-8
Set/restore rounding mode only when needed

The most common use case of math functions is with default rounding
mode, i.e. rounding to nearest.  Setting and restoring rounding mode
is an unnecessary overhead for this, so I've added support for a
context, which does the set/restore only if the FP status needs a
change.  The code is written such that only x86 uses these.  Other
architectures should be unaffected by it, but would definitely benefit
if the set/restore has as much overhead relative to the rest of the
code, as the x86 bits do.

Here's a summary of the performance improvement due to these
improvements; I've only mentioned functions that use the set/restore
and have benchmark inputs for x86_64:

Before:

cos(): ITERS:4.69335e+08: TOTAL:28884.6Mcy, MAX:4080.28cy, MIN:57.562cy, 16248.6 calls/Mcy
exp(): ITERS:4.47604e+08: TOTAL:28796.2Mcy, MAX:207.721cy, MIN:62.385cy, 15543.9 calls/Mcy
pow(): ITERS:1.63485e+08: TOTAL:28879.9Mcy, MAX:362.255cy, MIN:172.469cy, 5660.86 calls/Mcy
sin(): ITERS:3.89578e+08: TOTAL:28900Mcy, MAX:704.859cy, MIN:47.583cy, 13480.2 calls/Mcy
tan(): ITERS:7.0971e+07: TOTAL:28902.2Mcy, MAX:1357.79cy, MIN:388.58cy, 2455.55 calls/Mcy

After:

cos(): ITERS:6.0014e+08: TOTAL:28875.9Mcy, MAX:364.283cy, MIN:45.716cy, 20783.4 calls/Mcy
exp(): ITERS:5.48578e+08: TOTAL:28764.9Mcy, MAX:191.617cy, MIN:51.011cy, 19071.1 calls/Mcy
pow(): ITERS:1.70013e+08: TOTAL:28873.6Mcy, MAX:689.522cy, MIN:163.989cy, 5888.18 calls/Mcy
sin(): ITERS:4.64079e+08: TOTAL:28891.5Mcy, MAX:6959.3cy, MIN:36.189cy, 16062.8 calls/Mcy
tan(): ITERS:7.2354e+07: TOTAL:28898.9Mcy, MAX:1295.57cy, MIN:380.698cy, 2503.7 calls/Mcy

So the improvements are:

cos: 27.9089%
exp: 22.6919%
pow: 4.01564%
sin: 19.1585%
tan: 1.96086%

The downside of the change is that it will have an adverse performance
impact on non-default rounding modes, but I think the tradeoff is
justified.
Update Interlingua translation from translation project
Make more libm tests condition exceptions tests with math-tests.h.
Fix unsafe compiler optimization

GCC 4.8 enables -ftree-loop-distribute-patterns at -O3 by default and
this optimization may transform loops into memset/memmove calls. Without
proper handling this may generate unexpected PLT calls on GLIBC.
This patch fixes by create memset/memmove alias to internal GLIBC
__GI_memset/__GI_memmove symbols.
Improve precision of clock() function on Linux

Resolves #12515.

Use CLOCK_PROCESS_CPUTIME_ID instead of times to get better precision
in the value returned by clock.