Expand test/Driver/at_file.c test to check that PR16209 is fixed.

It was fixed by r186603.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186962 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/at_file.c b/test/Driver/at_file.c
index ea9004c..0541ece 100644
--- a/test/Driver/at_file.c
+++ b/test/Driver/at_file.c
@@ -16,6 +16,7 @@
 // CHECK: bar
 // CHECK: zed12
 // CHECK: one\two
+// CHECK: c:\foo\bar.c
 
 foo1
 foo2
@@ -32,3 +33,4 @@
 #endif
 foo12
 foo13
+foo14
diff --git a/test/Driver/at_file.c.args b/test/Driver/at_file.c.args
index 8e73597..8739000 100644
--- a/test/Driver/at_file.c.args
+++ b/test/Driver/at_file.c.args
@@ -10,3 +10,4 @@
 -D foo11
 -Dfoo12=zed12\
 -Dfoo13='one\\two'
+-Dfoo14='c:\foo\bar.c'
diff --git a/test/Driver/at_file.c.args.utf16le b/test/Driver/at_file.c.args.utf16le
index a2ff024..c219c60 100644
--- a/test/Driver/at_file.c.args.utf16le
+++ b/test/Driver/at_file.c.args.utf16le
Binary files differ