[MemorySanitizer] NFC. Do not use GET_INTRINSIC_MODREF_BEHAVIOR table.

It is now possible to infer intrinsic modref behaviour purely from intrinsic attributes.
This change will allow to completely remove GET_INTRINSIC_MODREF_BEHAVIOR table.

Differential Revision: http://reviews.llvm.org/D13907

llvm-svn: 250860