[msan] Remove readnone and friends from call sites.

MSan removes readnone/readonly and similar attributes from callees,
because after MSan instrumentation those attributes no longer apply.

This change removes the attributes from call sites, as well.

Failing to do this may cause DSE of paramTLS stores before calls to
readonly/readnone functions.

Differential Revision: https://reviews.llvm.org/D85259