Remove a workaround in the debug info handling of zero-sized types. #25468
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This fixes potential LLVM verifier errors in exploded variables with undefined
elments, because a few lines below the size of fragments is derived from the
size of the LLVM SSA value and the constant used in the deleted workaround is
always an i64.
rdar://problem/51343998
(cherry picked from commit a0463a8)