[analyzer] Enable temporary object destructor inlining by default.

When a temporary is constructed with a proper construction context, it should
be safe to inline the destructor. We have added suppressions for some of the
common false positives caused by such inlining, so there should be - and from my
observations there indeed is - more benefit than harm from enabling destructor
inlining.

Differential Revision: https://reviews.llvm.org/D44721

llvm-svn: 328258