Halve memory used by BloomFilter.java : readFrom() #5770
Description
guava/src/com/google/common/hash/BloomFilter.java
readFrom allocates a temporary bitmap (data) of the size required, fills it and then passes that to new LockFreeBitArray(data) which allocates the same amount of memory and copies the bitmap (data) which is then discarded.
If the bitmap (data) is say 100MB in size, then double that of memory used during this process (along with extra CPU in the copy).
The readFrom could allocate the LockFreeBitArray(data) itself and read the data directly into that bitmap instead of using a temporary intermediate bitmap.