[sil-performance-inliner] Re-introduce inlining of generics as a staging feature behind a flag #5265
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Use the following options to enable this flag: -Xllvm -sil-inline-generics
Generic inlining is now handled by a dedicated logic in isProfitableToInlineGeneric. This makes it easier to find this logic. And it will make it easier to extend and improve it in the future.
The initial policy for generic inlining is:
There are slight standard library's code-size regressions with this policy. They will be addressed by the future work on the generic inlining.