Fix warning for unused function when the header is included in
an implementation file that does not use this function.
--
PiperOrigin-RevId:
247622232
/// a plain walk over operations to match flat patterns but the current
/// implementation is competitive nonetheless.
using FilterFunctionType = std::function<bool(Operation &)>;
-static bool defaultFilterFunction(Operation &) { return true; }
+inline bool defaultFilterFunction(Operation &) { return true; }
struct NestedPattern {
NestedPattern(ArrayRef<NestedPattern> nested,
FilterFunctionType filter = defaultFilterFunction);