[trivial] clear stack variable by function#438

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isle2983 wants to merge 2 commits intobitcoin-core:masterfrom

isle2983:PR-dead-assignment

Commits on Jan 29, 2017

Example 1 - avoid optimizing out stack variable clearing by using an __attribute__
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Example 2 - avoid optimizing out stack variable clearing by using the 'volatile' keyword
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