Update bionic after Clang rebase

After the new rebase of Clang, we now supports alloc_size attribute, so
we can remove the warning about switching to alloc_size once Clang has
support.

Compiler.setInvocation has changed argument type from raw pointer to
shared pointer. Add version check here so that we can build under either
old rebase or the new rebase.

Test: build
Bug: 37423073
Change-Id: I4563eaf93bae6c59a4a19318f8caa92bd361b3ab