core/filtermaps: ensure 8 byte alignment of struct fields

core/filtermaps/matcher.go

@@ -334,11 +334,11 @@ func mergeResults(results []potentialMatches) potentialMatches {
 // gives a match at X+offset. Note that matchSequence can be used recursively to
 // detect any log value sequence.
 type matchSequence struct {
+	baseEmptyRate, nextEmptyRate uint64 // first in struct to ensure 8 byte alignment
 	params                       *Params
 	base, next                   matcher
 	offset                       uint64
 	// *EmptyRate == totalCount << 32 + emptyCount (atomically accessed)
-	baseEmptyRate, nextEmptyRate uint64
 }
 
 // newMatchSequence creates a recursive sequence matcher from a list of underlying