glibc : stable 2.31 branch updates.

glibc : stable 2.31 branch updates.

Below commits on glibc-2.31 stable branch are updated.
d4b7559457 x86-64: Require BMI2 for avx2 functions [BZ #29611]
b8bb48a18d x86-64: Require BMI2 for strchr-avx2.S [BZ #29611]
c8f2a3e803 Add test for bug 29530
e6ae5b25cd Fix memmove call in vfprintf-internal.c:group_number
1dbe841a67 Remove most vfprintf width/precision-dependent allocations (bug 14231, bug 26211).
5a802723db stdio: Add tests for printf multibyte convertion leak [BZ#25691]
ae7748e67f stdio: Remove memory leak from multibyte convertion [BZ#25691]
174d0b61c7 Linux: Require properly configured /dev/pts for PTYs
0a167374fd Linux: Detect user namespace support in io/tst-getcwd-smallbuff
4ad1659d8c getcwd: Set errno to ERANGE for size == 1 (CVE-2021-3999)
3319cea99e support: Add helpers to create paths longer than PATH_MAX
f733e291bb support: Fix xclone build failures on ia64 and hppa
43757c70ee support: Add xclone
29d3aeb0e8 Add xchdir to libsupport.
2d7720f316 support: Add create_temp_file_in_dir
183709983d NEWS: Add a bug fix entry for BZ #28896
d385079bd5 x86: Fix TEST_NAME to make it a string in tst-strncmp-rtm.c
7df3ad6560 x86: Test wcscmp RTM in the wcsncmp overflow case [BZ #28896]
fc133fcf49 x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ #28896]
775c05b28c string: Add a testcase for wcsncmp with SIZE_MAX [BZ #28755]
c6b346ec55 x86-64: Test strlen and wcslen with 0 in the RSI register [BZ #28064]
0675185923 x86: Remove wcsnlen-sse4_1 from wcslen ifunc-impl-list [BZ #28064]
5db3239baf x86: Black list more Intel CPUs for TSX [BZ #27398]
5b99f172b8 x86: Check RTM_ALWAYS_ABORT for RTM [BZ #28033]
70d293a158 NEWS: Add a bug fix entry for BZ #27974
a2be2c0f5d String: Add overflow tests for strnlen, memchr, and strncat [BZ #27974]
489006c3c5 x86: Optimize strlen-evex.S
937f2c783a x86: Fix overflow bug in wcsnlen-sse4_1 and wcsnlen-avx2 [BZ #27974]
0058c73d11 x86-64: Add wcslen optimize for sse4.1
665d0252f1 x86-64: Move strlen.S to multiarch/strlen-vec.S
82ff13e2cc x86-64: Fix an unknown vector operation in memchr-evex.S
539b593a1d x86: Optimize memchr-evex.S
7b37ae60c6 x86: Optimize strlen-avx2.S
0381c1c10d x86: Fix overflow bug with wmemchr-sse2 and wmemchr-avx2 [BZ #27974]
10368cb76b x86: Optimize memchr-avx2.S
66ca40582e test-strnlen.c: Check that strnlen won't go beyond the maximum length
927bcaf892 test-strnlen.c: Initialize wchar_t string with wmemset [BZ #27655]
0d4159c36c x86-64: Require BMI2 for __strlen_evex and __strnlen_evex
c0cbb9345e NEWS: Add a bug fix entry for BZ #27457
e81b975fcc x86-64: Fix ifdef indentation in strlen-evex.S
aa4e48e73c x86-64: Use ZMM16-ZMM31 in AVX512 memmove family functions
ac911d3b57 x86-64: Use ZMM16-ZMM31 in AVX512 memset family functions
20d37de533 x86: Add string/memory function tests in RTM region
fbaa99ed41 x86-64: Add AVX optimized string/memory functions for RTM
096e14f632 x86-64: Add memcmp family functions with 256-bit EVEX
f00fad4e4c x86-64: Add memset family functions with 256-bit EVEX
cf239ddd2e x86-64: Add memmove family functions with 256-bit EVEX
7257ba7bf2 x86-64: Add strcpy family functions with 256-bit EVEX
db9071c0f6 x86-64: Add ifunc-avx2.h functions with 256-bit EVEX
2d612b2c5f x86: Set Prefer_No_VZEROUPPER and add Prefer_AVX2_STRCMP
5b13651085 NEWS: Add a bug fix entry for BZ #28755
5ee8a436ab x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]

Signed-off-by: Sundeep KOKKONDA <sundeep.kokkonda@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>