Fix spurious "infinite conformance substitution" error with parameter packs #85094
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…servePackExpansionLevel The "iterate until fixed point" would cause an infinite loop where we wrap type parameter packs in a PackElementType and increase the level forever otherwise. This was a regression from commit 103428f. Fixes rdar://160804717.
…lags::PreservePackExpansionLevel
…s if nothing to do
slavapestov
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AnthonyLatsis,
hborla,
jckarter,
rjmccall and
xedin
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slavapestov
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The actual bug fix is just the first commit. The rest are cleanups.
Fixes rdar://160804717.