recognize PLUS and XOR forms of rldimi (PR target/105991, #2095789)

always ship liblsan on s390x (#2104824)

update from releases/gcc-12 branch
PRs c++/49387, c++/102307, c++/102651, c++/104470, c++/105491, c++/105589,
profile/105535, ipa/100413, ipa/105600, ipa/105639, ipa/105739,
end/105537,
end/105604, middle-end/105711, middle-end/105951,
end/105998, middle-end/106030, other/105527,
optimization/105455, rtl-optimization/105559,
optimization/105577, sanitizer/105714, sanitizer/105729,
optimization/103116,
optimization/105431, tree-optimization/105458,
optimization/105528, tree-optimization/105562,
optimization/105618, tree-optimization/105726,
optimization/105736, tree-optimization/105786,
optimization/105940
enable tsan and lsan on s390x (#2101610)
fix up libtsan on s390x
fix nvptx build (PRs bootstrap/105551, target/105938)

ship lto-dump (#2101835)

use gcc-toolset-12-binutils

don't provide g++/fortran (CS-1145)

require system binutils

don't skip testing on s390x

use GTS 12 binutils
add missing headers (#2091572)

update to GCC 12 (#2077276)

avoid overly-greedy match in dejagnu regexp (#2049712)

update from releases/gcc-11-branch (#2047286)
PRs fortran/104127, fortran/104212, fortran/104227, target/101529
fix up va-opt-6.c testcase

update from releases/gcc-11-branch (#2047286)
PRs ada/103538, analyzer/101962, bootstrap/103688, c++/85846, c++/95009,
end/101751, middle-end/102860, middle-end/103813, objc/103639,
optimization/102478,
optimization/103837, rtl-optimization/103860,
optimization/103908, sanitizer/102911, target/102347,
optimization/101615, tree-optimization/103523,
optimization/103603, tree-optimization/103995

fix dg-ice tests (#2037072)

update Intel Tremont tuning patches (#2014276)
backport Intel Alderlake tuning (#2023553)

update from releases/gcc-11-branch (#1996862)
PRs ada/100486, c++/70796, c++/92746, c++/93286, c++/94490, c++/102642,
profile/100520, ipa/102714,
end/64888,
end/101480, middle-end/102431, middle-end/102518,
end/103059, middle-end/103181, middle-end/103248,
end/103384, preprocessor/103130, rtl-optimization/102356,
optimization/102842, target/101985, target/102976, target/102991,
optimization/100393, tree-optimization/102139,
optimization/102505, tree-optimization/102572,
optimization/102788, tree-optimization/102789,
optimization/102798, tree-optimization/102970,
optimization/103192, tree-optimization/103204,
optimization/103237, tree-optimization/103255,
optimization/103435
fix up #__VA_OPT__ handling (PR preprocessor/103415)