[5.1]Disable typo-correction by default until we can make it work within acceptable performance bounds #25750
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Typo-correction can be so expensive that it can slow down typechecking over 10x.
It can be a significant productivity drain for developing on large projects.
Unfortunately it is best that we disable it until we can dedicate the time to address its performance issues
and we are certain it works within acceptable performance bounds.
rdar://51966070
master: #25674