C++ modules: MSVC support
Adds support for MSVC using P1689r5 (at least VS 2022 Update 3 Preview; toolchain version 14.33.31627). Note that partitions do not quite work (reported to Microsoft).
A GitLab update will be applied on April 24th, between 8am and 10am, EST (UTC-05:00). This site may have intermittent delays during that time.
Adds support for MSVC using P1689r5 (at least VS 2022 Update 3 Preview; toolchain version 14.33.31627). Note that partitions do not quite work (reported to Microsoft).