[pull] swiftwasm from main #1929
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RCIdentityAnalysis must not look through casts which cast from a trivial type, like a metatype, to something which is retainable, like an AnyObject. On some platforms such casts dynamically allocate a ref-counted box for the metatype. Now, if the RCRoot of such an AnyObject would be a trivial type, ARC optimizations get confused and might eliminate a retain of such an object completely. rdar://problem/69900051
SILOptimizer: fix ARC code motion problem for metatype casts.
MaxDesiatov
approved these changes
Oct 6, 2020
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