[analyzer] SATestBuild.py: Fix hang when one of the tasks fails

Summary:
Tasks can crash with many different exceptions including SystemExit.
Bare except still causes a warning, so let's use BaseException instead.

Differential Revision: https://reviews.llvm.org/D80443

clang/utils/analyzer/SATestBuild.py

@@ -633,7 +633,7 @@ class TestProjectThread(threading.Thread):
 
                 self.tasks_queue.task_done()
 
-            except CalledProcessError:
+            except BaseException:
                 self.failure_flag.set()
                 raise