Tim Northover 1061ccca8c ARM: don't try to create an i8 -> i32 vpaddl.
DAG combine was mistakenly assuming that the step-up it was looking at was
always a doubling, but it can sometimes be a larger extension in which case
we'd crash.

llvm-svn: 301002
2017-04-21 17:21:59 +00:00
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