Fix assert when emitting llvm.pow.f86.
This occurred due to introducing the invalid i64 type after type
legalization had already finished, in an attempt to workaround bitcast
f64 -> v2i32 not doing constant folding.
The *right* thing is to actually fix bitcast, but that has other
complications. So, for now, just get rid of the broken workaround, and
check in a test-case showing that it doesn't crash, with TODOs for
emitting proper code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@249908
91177308-0d34-0410-b5e6-
96231b3b80d8
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