cache: follow move of upstream library github.com/coreos/bbolt github.com/etcd-io/bbolt

vendor/github.com/etcd-io/bbolt/bolt_amd64.go

@@ -0,0 +1,10 @@
+package bbolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0x7FFFFFFF
+
+// Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false