Change *BugReport constructors to take StringRefs.

- Eliminates many calls to std::string.c_str()
- Fixes an invalid read in ReturnStackAddressChecker due to an unsafe call to
  StringRef.data() which doesn't guarantee null-termination.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@88779 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/FixedAddressChecker.cpp b/lib/Analysis/FixedAddressChecker.cpp
index e30e3d0..80096dc 100644
--- a/lib/Analysis/FixedAddressChecker.cpp
+++ b/lib/Analysis/FixedAddressChecker.cpp
@@ -59,8 +59,7 @@
                           "Using a fixed address is not portable because that "
                           "address will probably not be valid in all "
                           "environments or platforms.");
-    RangedBugReport *R = new RangedBugReport(*BT, BT->getDescription().c_str(),
-                                             N);
+    RangedBugReport *R = new RangedBugReport(*BT, BT->getDescription(), N);
     R->addRange(B->getRHS()->getSourceRange());
     C.EmitReport(R);
   }