Fix the memory usage of the /source/fe unity files. #5925
Merged
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Recent changes, such as b15febd, 36b74d6, and fd1bf6a caused the memory usage of one of the unity files to go above 5 GB: these splits lower the high water mark to about 3 GB.
I suspect
make_shared
is the culprit here: GCC's version is a huge memory hog.