Auto-sync with upstream branch master
Upstream commit: bcdaad21d4635931d1bd3b54a7894276925d081d
- malloc: tcache double free check
- [AArch64] Adjust writeback in non-zero memset
- Update config.guess and config.sub to current versions.
- support: Print timestamps in timeout handler
- Use STRFMON_LDBL_IS_DBL instead of __ldbl_is_dbl.