Remove unused and slow 'protocol implementations' analysis #15667
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This was performing a walk over all parsed Decls in all sources files, to build a data structure that was never used.
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We were walking the entire AST for all source files once per SIL module -- which is still once per source file in batch mode, so its quadratic. And the results of the analysis were unused, so nuke it.
Also, remove some code from the SIL linker that was completely dead.