Don't stat in Builder#write
Don't stat in Builder#write

The only reason for the files.stat in atomicallyRewriteFile (called
by Builder#write), which was taking up time comparable to write
and rename (not as much as one of those but same order of
magnitude, in the hundreds of ms total)... was for the case where we
are trying to rename a file in a way that overwrites an existing
directory.  We can avoid the stat by catching this unusual case when
rename throws an error.

AnthonyAstige/meteor,chasertech/meteor,4commerce-technologies-AG/meteor,lorensr/meteor,DAB0mB/meteor,AnthonyAstige/meteor,jdivy/meteor,chasertech/meteor,Hansoft/meteor,chasertech/meteor,nuvipannu/meteor,AnthonyAstige/meteor,DAB0mB/meteor,jdivy/meteor,lorensr/meteor,AnthonyAstige/meteor,DAB0mB/meteor,mjmasn/meteor,4commerce-technologies-AG/meteor,lorensr/meteor,nuvipannu/meteor,jdivy/meteor,chasertech/meteor,lorensr/meteor,4commerce-technologies-AG/meteor,chasertech/meteor,DAB0mB/meteor,AnthonyAstige/meteor,4commerce-technologies-AG/meteor,jdivy/meteor,jdivy/meteor,mjmasn/meteor,DAB0mB/meteor,chasertech/meteor,Hansoft/meteor,Hansoft/meteor,AnthonyAstige/meteor,AnthonyAstige/meteor,mjmasn/meteor,AnthonyAstige/meteor,4commerce-technologies-AG/meteor,nuvipannu/meteor,mjmasn/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,Hansoft/meteor,lorensr/meteor,nuvipannu/meteor,Hansoft/meteor,jdivy/meteor,jdivy/meteor,Hansoft/meteor,DAB0mB/meteor,Hansoft/meteor,nuvipannu/meteor,chasertech/meteor,mjmasn/meteor,nuvipannu/meteor,mjmasn/meteor,4commerce-technologies-AG/meteor,DAB0mB/meteor,lorensr/meteor,nuvipannu/meteor,lorensr/meteor