Add minnum / maxnum intrinsics

These are named following the IEEE-754 names for these
functions, rather than the libm fmin / fmax to avoid
possible ambiguities. Some languages may implement something
resembling fmin / fmax which return NaN if either operand is
to propagate errors. These implement the IEEE-754 semantics
of returning the other operand if either is a NaN representing
missing data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220341 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Vectorize/BBVectorize.cpp

@@ -685,6 +685,8 @@ namespace {
       case Intrinsic::trunc:
       case Intrinsic::floor:
       case Intrinsic::fabs:
+      case Intrinsic::minnum:
+      case Intrinsic::maxnum:
         return Config.VectorizeMath;
       case Intrinsic::bswap:
       case Intrinsic::ctpop: