Adding a checker (cert-err52-cpp) that detects use of setjmp or longjmp in C++...

Adding a checker (cert-err52-cpp) that detects use of setjmp or longjmp in C++ code. Corresponds to the CERT C++ secure coding rule: https://www.securecoding.cert.org/confluence/pages/viewpage.action?pageId=1834

llvm-svn: 249727