v1.5.12 - Backport security fix from Geth v1.6.5

This is a security release to address an attack vector seen on the Ethereum network. It contains the fix released in Geth v1.6.5.

Change:

• Use a bitmap instead of a hashmap to store the results of jumpdest analysis, and optimise analysis process.

This release is highly recommended as it is a security fix that could potentially take nodes offline if the network is attacked.

$ shasum -a 256 *
134b693a411d9627ea7399a9c4d29b9d8d3f519239469d29169448c6be68f0b5  gubiq-darwin-amd64
227c73d0a1fe0dc752d0b0abaf0ddc988f76f8170535ad856ca9b509f6a4d482  gubiq-linux-amd64
a829e87ef6586a1bb3ad5f0d66c553970c5365da9344bd9af8dccef11a85364f  gubiq-linux-arm-7
56b653e31665df2eb82a6d76abc9dd25b448323158274b3107b86a7402f0e7d7  gubiq-windows-4.0-amd64.exe