Duncan P. N. Exon Smith 9cd7a4b72d IR: Use remove_if for Instruction::dropUnknownMetadata()
Technically the operations are different -- the old logic moved items
from the back into the opened-up slots, instead of the usual
`remove_if()` logic of a slow and a fast iterator -- but unless a
profile tells us otherwise I prefer the simpler logic here.  Regardless,
there shouldn't be an observable function change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235767 91177308-0d34-0410-b5e6-96231b3b80d8
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