[PATCH] [ASan] Test churn for setting ASAN_OPTIONS=symbolize_vs_style=false

[Alexey Samsonov]

In http://reviews.llvm.org/D10294#185931, @samsonov wrote:

> Wait a second, why can't you set
>
>   config.environment['ASAN_OPTIONS'] = 'symbolize_vs_style=false'


OK, I see that you've already done it, my bad, but...

>   `ASAN_OPTIONS=$ASAN_OPTIONS:<....>` in the tests which set this env variable?


^^
Why can't we use this form instead?


http://reviews.llvm.org/D10294

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