When computing the region to search for deinit barriers, include _all_ destroys of a canonical liverange - including destroys of all copies.
Before this fix, only destroys of the original def were considered which resulted in moving destroys across deinit barriers.
Fixes a miscompile
rdar://168337959
We cannot compute the liverange of a value if it bit-wise escapes.
This fixes a mis-compile in copy-propagation which hoists a destroy_value over a use of the escaped value when lexical liveranges are disabled.
The test case is a simplified SIL sequence from the stdlib core where this problem shows up, because we build the stdlib core with disabled lexical liveranges.
Erik Eckstein
Andrew Trick
Nate Chandler