[LegalizeDAG] ExpandLegalINT_TO_FP - cleanup UINT_TO_FP i64 -> f64 expansion.

Use SrcVT/DestVT types, correct shift type and AND instead of ZERO_EXTEND_IN_REG.

Part of prep work for D52965

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344602 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed