fix crash when printing diagnostics with tokens that span through more than one line

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54365 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/text-diag.c b/test/Sema/text-diag.c
new file mode 100644
index 0000000..2e31291
--- /dev/null
+++ b/test/Sema/text-diag.c
@@ -0,0 +1,4 @@
+// RUN: clang -fsyntax-only %s
+unsigned char *foo = "texto\
+que continua\
+e continua";