[docs][PerformanceTips] Add text on allocas and alignment

Description

[docs][PerformanceTips] Add text on allocas and alignment

This summarizes two recent llvm-dev discussions. Most of the text provided by David Chisnall and Benoit Belley with minor editting by me.

Details

Committed
reamesSep 10 2015, 10:03 AM
Parents
rL247300: [libFuzzer] add two more variants of FuzzerDriver for convenience
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