Increase fibers stack size if we're running with ASAN
Summary:
In most cases user is not aware of ASAN and fiber stack problem, thus if the stackSize is specified we're not detecting ASAN and probably will crash.
And thus it doesn't seem like a good idea to make it a user responsibility to detect ASAN.
Test Plan: tests
Reviewed By: andrii@fb.com
Subscribers: alikhtarov, folly-diffs@, yfeldblum, chalfant
FB internal diff:
D2058741
Tasks:
7016680
Signature: t1:
2058741:
1431131082:
9a41eb40d756c9c7af0632f7ecd55c17d10bb189