Geth 1.4.15 released | Hotfix to address DoS Attack Vectors

Geth 1.4.15 is a hotfix release to address two DoS attack vectors abused on the mainnet:

Wasted CPU resources by abusing the EVMs JUMPDEST cache’s key generation.
Huge memory and CPU consumption by abusing quadratic contract state dirty tracking.
Please update ASAP. Further optimizations will most probably follow as we comb the code for bottlenecks.

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