Revert "[asan] Export __asan_default_options() so it has an effect"

This reverts commit 1154fc1bf13c1d9f9326878c9826a23922e564df.

Reason for revert: I believe that this is breaking compile on both garnet and peridot CI.  See IN-756

Original change's description:
> [asan] Export __asan_default_options() so it has an effect
> 
> With -fvisibility=hidden, __asan_default_options is never seen by
> the ASan runtime DSO and so has no effect.  Export it explicitly
> to make sure it is seen as referenced at link time and gets into
> the dynamic symbol table.
> 
> Test: CQ
> Change-Id: Ia5b4bea5b1d22b41de6570a2bbefac3688b88f69

TBR=phosek@google.com,aarongreen@google.com,mcgrathr@google.com,jakehehrlich@google.com

Change-Id: Ie40c3c17d234e6de87387e5a9e06841327dc1b01
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
1 file changed