Revert "[analyzer] Disable STL inlining. Blocked by PR13724."

While PR13724 is still an issue, it's not actually an issue in the STL.
We can keep this option around in case there turn out to be widespread
false positives due to poor modeling of the C++ standard library functions,
but for now we'd like to get more data.

This reverts r163633 / c6baadceec1d5148c20ee6c902a102233c547f62.

llvm-svn: 163647