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An exception is thrown via a call to _cxa_throw, which we don't expect to return. Therefore, the "true" part of the invoke goes to a BB that has 'unreachable' as its only instruction. This is lowered into an empty MachineBB. The landing pad for this invoke, however, is directly after the "true" MBB. When the empty MBB is removed, the landing pad is directly below the BB with the invoke call. The unconditional branch is removed and then the two blocks are merged together. The testcase is too big for a regression test. <rdar://problem/9305728> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129965 91177308-0d34-0410-b5e6-96231b3b80d8
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