[5.0][Parse] Eliminate backtracking in collection expression parsing #21674
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(Cherry picked from #21487 )
Parsing collection literal expression used to take exponential time depending on the nesting level of the first element.
Stop using
parseList()
because using it complicates libSyntax parsing.rdar://problem/45221238 / https://bugs.swift.org/browse/SR-9220
rdar://problem/38913395 / https://bugs.swift.org/browse/SR-7283