[port] Further LevelDB ports #755
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3ee3d04 Add extra LevelDB source to Makefile (MarcoFalke) 2424989 leveldb: enable runtime-detected crc32 instructions (Cory Fields) cf44e4c Squashed 'src/leveldb/' changes from a31c8aa40..196962ff0 (Pieter Wuille) Tree-SHA512: 19ade77e3f6265507b3ab7b9aa5150d378aa0751e24ac7a61567b0f720a566cedc6c3d3336da17a3bd2b5d068ee86600d96a15228f78bd20ccf98c8fc9041a91
…c32 functions d34d77a build: verify that the assembler can handle crc32 functions (Cory Fields) Pull request description: Also, enable crc32 even if -msse4.2 wasn't added by us, as long as it works. This allows custom flags (such as -march=native) to work as expected. Addresses #10670.
b13a68e Squashed 'src/leveldb/' changes from 196962ff0..c521b3ac6 (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields)
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Furher ports from Core's fork of LevelDB, this PR depends on #754.
1. Port of Core's #10806: build: verify that the assembler can handle crc32 functions
Pull request description:
Also, enable crc32 even if -msse4.2 wasn't added by us, as long as it works. This allows custom flags (such as -march=native) to work as expected.
Addresses #10670.

2. Port of Core's #10958: Update to latest Bitcoin patches for LevelDB
Pull request description:
Includes: