Emit a DW_OP_deref for global variables in a fixed size buffer. #16342
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Note that this is only correct unless the variable uses inline
storage. This makes the majority of resilient types in Foundation work
as global variables. The correct solution would be for LLDB to poke
at the runtime to figure out whether the storage is inline or not, but
until then this is the next best thing.
rdar://problem/39722386
(cherry picked from commit 2c7a698)
See #16318 for more discussion.