[X86] Cleanup convertIntLogicToFPLogic a little. NFCI
-Use early returns to reduce indentation
-Replace multipe ifs with a switch.
-Replace an assert with an llvm_unreachable default in the switch.
-Check that the FP type we're going to use for the
X86ISD::FAND/FOR/FXOR is legal rather than checking that the
integer type matches the width of a legal scalar fp type. This all
runs after legalization so it shouldn't really matter, but making
sure we're using a valid type in the X86ISD node is really
whats important.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362565
91177308-0d34-0410-b5e6-
96231b3b80d8
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