Skip parsing types in ILLinkTrim.Descriptors if not needed #79803
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We should not even be using this parser (#79802). It's surprisingly slow.
This saves about 10% of wallclock time when compiling Hello World (yes, I can't believe my measurements either). We parse the descriptors for the purposes of manifest resources pretty late in the single threaded phase and apparently there's a lot of things to parse that we don't care about.
Cc @dotnet/ilc-contrib