[SelectionDAG] Improve support for promotion of <1 x fX> floating point argument types (PR31088)
PR31088 demonstrated that we were assuming that only integers require promotion from <1 x iX> types, when in fact float types may require it as well - in this case half floats.
This patch adds support for extension/truncation for both integer and float types.
Differential Revision: https://reviews.llvm.org/D32391
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301910
91177308-0d34-0410-b5e6-
96231b3b80d8
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