Implement -Wconversion.  Off by default, in the non-gcc group.  There's
significant work left to be done to reduce the false-positive rate here.

llvm-svn: 86326
diff --git a/clang/test/Analysis/array-struct.c b/clang/test/Analysis/array-struct.c
index d6b6076..3137967 100644
--- a/clang/test/Analysis/array-struct.c
+++ b/clang/test/Analysis/array-struct.c
@@ -120,7 +120,7 @@
 // building: a->e, e->d. Only then 'a' could be added to live region roots.
 void f13(double timeout) {
   struct s1 a;
-  a.e.d = (long) timeout;
+  a.e.d = (int) timeout;
   if (a.e.d == 10)
     a.e.d = 4;
 }