[temp][do not merge] probe: #770 MSVC LTO facts, #771 member DLL link flags, #769 std.compat - #772

[temp][do not merge] probe: #770 MSVC LTO facts, #771 member DLL link flags, #769 std.compat#772

Sunrisepeak wants to merge 4 commits into

mainmcpp-community/mcpp:mainfrom

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