Fix use of non-existing variable in crashlog.py
Fix use of non-existing variable in crashlog.py

Summary:
The method find_matching_slice(self) uses uuid_str on one of the paths but the variable does not exist and so this results in a NameError exception if we take that path.

Differential Revision: https://reviews.llvm.org/D57467

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@352772 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit cf4db884f6adf7f1a6901469656a803ae30a0ee7)

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb