win/asan: Roll clang 235968:238562, stop having a dedicated asan version.
win/asan: Roll clang 235968:238562, stop having a dedicated asan version.

The last time we tried to roll asan on the lkgr bot it caused bot timeouts.
Since we don't see that on our trunk bots, I'm trying this again -- it's likely
this will cause timeouts again and will have to be reverted again.

Since regular clang is now pinned, the asan bot can use the regular pinned
version instead of having its own pinned version.

If this sticks, we can reenable the oilpan plugin in asan configurations again.

BUG=487929,489123,483065

Review URL: https://codereview.chromium.org/1162923002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#332294}

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