[Driver] Link shared asan runtime lib with -z now on Solaris/x86

As detailed in Issue #64126, several asan tests `FAIL` due to a cycle in
`AsanInitInternal`.  This can by avoided by disabling lazy binding with `ld
-z now`.

Tested on `amd64-pc-solaris2.11` and `x86_64-pc-linux-gnu`.

Differential Revision: https://reviews.llvm.org/D156325