Fix two bugs with an @throw that doesn't have a statement.
- ObjCAtThrowStmt::getSourceRange() needs to check if it has a statement (and not go "boom":-)
- RewriteTest::RewriteObjCThrowStmt() needs to generate refer to the current exception. 



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46184 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed