[analyzer] Enable pseudo-destructor expressions.

These are cases where a scalar type is "destructed", usually due to
template instantiation (e.g. "obj.~T()", where 'T' is 'int'). This has
no actual effect and the analyzer should just skip over it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186927 91177308-0d34-0410-b5e6-96231b3b80d8