[analyzer] ExprEngine: Escape pointers in bitwise operations

Summary:
After evaluation it would be an Unknown value and tracking would be lost.

Reviewers: NoQ, xazax.hun, ravikandhadai, baloghadamsoftware, Szelethus

Reviewed By: NoQ

Subscribers: szepet, rnkovacs, a.sidorin, mikhail.ramalho, donat.nagy,
             dkrupp, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D63720

llvm-svn: 364259