Potential overflow when store ActionTypes in schemaDiff

[Defined2014]

Enhancement

tidb/domain/domain.go

Lines 345 to 355 in 1ddc592

	}
	if canSkipSchemaCheckerDDL(diff.Type) {
	continue
	}
	phyTblIDs = append(phyTblIDs, IDs...)
	for i := 0; i < len(IDs); i++ {
	actions = append(actions, uint64(1<<diff.Type))
	}
	}
	is := builder.Build()

See the code above, we used int64(1<<diff.Type) to store the ddl type before, but this will overflow when the ddl type is greater than 64 (now the biggest one is 67). IMO, we could store the type directly instead of left shift it.