KeychainAPI checker: Track SymbolMetadata instead of MemRegion in checker state so that we could clear the state on evalDeadSymbols; also track the return value.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137003 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed