Add optional record of "location" SVals in the environment.  When we analyzing loads/stores, we lose the location SVal, which makes it difficult to recover in some cases (e.g., for post diagnostics).  This is prep for pending changes to GRExprEngine.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@112930 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed