AMDGPU: Fix verifier errors in SILowerControlFlow
The main sin this was committing was using terminator
instructions in the middle of the block, and then
not updating the block successors / predecessors.
Split the blocks up to avoid this and introduce new
pseudo instructions for branches taken with exec masking.
Also use a pseudo instead of emitting s_endpgm and erasing
it in the special case of a non-void return.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273467
91177308-0d34-0410-b5e6-
96231b3b80d8
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