Changes

Fix tests of constant folding of fp operations on NaN values
Fix failures introduced due to change rG0b336b6048ae.

[mlir] Fix LLVM intrinsic convesion generator for overloadable types.
Summary: If an intrinsic has overloadable types like llvm_anyint_ty or 
llvm_anyfloat_ty then to getDeclaration() we need to pass a list of the
types that are "undefined" essentially concretizing them.
This patch add support for deriving such types from the MLIR op that has
been matched.
Reviewers: andydavis1, ftynse, nicolasvasilache, antiagainst
Subscribers: mehdi_amini, rriddle, jpienaar, burmako, shauheen,
arpith-jacob, mgester, lucyrfox, liufengdb, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D72974