CrashRecovery: Clear the current context on the first crash, to avoid re-entering it if the cleanup code crashes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111309 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/CrashRecoveryContext.cpp

@@ -38,6 +38,10 @@ public:
   }
 
   void HandleCrash() {
+    // Eliminate the current context entry, to avoid re-entering in case the
+    // cleanup code crashes.
+    CurrentContext.erase();
+
     assert(!Failed && "Crash recovery context already failed!");
     Failed = true;