[MLIR][SparseTensor] Add missing #undef REMUI and DIVUI (#188686)
LoopEmitter.cpp and SparseTensorIterator.cpp define REMUI and DIVUI
macros but the existing #undef block at the end of each file omits them.
This can leak the macros into subsequent translation units in unity
builds. See https://discourse.llvm.org/t/rfc-enabling-unity-build/90306
for more info.
"clauded" not coded
