stdlib: enable runtime checking for COW support by default in assert builds. #32385
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Array literals only need to be finalized, if the array is really allocated. In case of zero elements, no allocation is done, but the empty-array singleton is used. "Finalization" means to emit an end_cow_mutation instruction on the array. As the empty-array singleton is a read-only and shared object, it's not legal to do a end_cow_mutation on it.
…builds. This was blocked by an LLDB problem, which is now fixed (swiftlang/llvm-project#1333)
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This was blocked by an LLDB problem, which is now fixed (swiftlang/llvm-project#1333)
Also: fix a bug with array literal finalization (see commit message for details)