[analyzer] Fix a crash on logical operators with vectors.

Do not crash when trying to compute x && y or x || y where x and y are
of a vector type.

For now we do not seem to properly model operations with vectors. In particular,
operations && and || on a pair of vectors are not short-circuit, unlike regular
logical operators, so even our CFG is incorrect.

Avoid the crash, add respective FIXME tests for later.

Differential Revision: https://reviews.llvm.org/D39682

rdar://problem/34317663


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317700 91177308-0d34-0410-b5e6-96231b3b80d8