Partially activate more Header Units test coverage #1628
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The Microsoft-internal compiler bug VSO-1271718 "Standard Library Header Units ICE with C++20 chrono" has been fixed for VS 2019 16.10 Preview 1. To prevent compiler regressions between now and the time when Preview 1 ships publicly, we should activate the affected parts of the Standard Library Header Units test for the MSVC-internal test harness.
When Preview 1 is publicly available, we'll be able to remove these workarounds unconditionally.
As an aside, what triggered this ICE was the technique needed to implement LWG-3260:
STL/stl/inc/chrono
Lines 1253 to 1254 in 47cd703