Revert "[analyzer] Refactor conditional expression evaluating code"

Revert "[analyzer] Refactor conditional expression evaluating code"

This reverts commit r189090.

The original patch introduced regressions (see the added live-variables.* tests). The patch depends on the correctness of live variable analyses, which are not computed correctly. I've opened PR18159 to track the proper resolution to this problem.

The patch was a stepping block to r189746. This is why part of the patch reverts temporary destructor tests that started crashing. The temporary destructors feature is disabled by default.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@196593 91177308-0d34-0410-b5e6-96231b3b80d8