When a scf.while op has a loop-carried value whose type converts to
emitc::ArrayType (e.g. memref<1xf64>), the WhileLowering pattern
unconditionally called emitc::LValueType::get(arrayType), which
triggered an assertion because LValueType cannot wrap an array type.
Fix by returning a match failure in createVariablesForResults and
createVariablesForLoopCarriedValues when the converted type is an
emitc::ArrayType. This converts the crash into a proper legalization
failure.
Fixes#182649
8ac00ba7f9