Tim Northover f4523b0efd ARM: avoid clobbering register in v6 jump-table expansion.
If we got unlucky with register allocation and actual constpool placement, we
could end up producing a tTBB_JT with an index that's already been clobbered.

Technically, we might be able to fix this situation up with a MOV, but I think
the constant islands pass is complex enough without having to deal with more
weird edge-cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297871 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-15 18:38:13 +00:00
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