[closure-lifetime-fixup] When emitting a load_borrow, make sure to em… #20079
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…it the end_borrow for it as well.
In this commit I added a more convenient API for doing this sort of operation.
Specifically: SILBuilder::emitScopedBorrowOperation. This performs either a
load_borrow or begin_borrow, then calls a user provided closure, and finally
inserts the end_borrow after the scope has closed.
rdar://43398898