Handle '-r' option properly

Summary:
This fixs the bug
https://llvm.org/bugs/show_bug.cgi?id=12587

Patch by Yunlian Jiang

Reviewers: Bigcheese, rnk

Differential Revision: http://reviews.llvm.org/D10279

llvm-svn: 247351
diff --git a/clang/test/Driver/Xlinker-args.c b/clang/test/Driver/Xlinker-args.c
index 87b238b..a828f15 100644
--- a/clang/test/Driver/Xlinker-args.c
+++ b/clang/test/Driver/Xlinker-args.c
@@ -3,17 +3,17 @@
 
 // RUN: %clang -target i386-apple-darwin9 -### \
 // RUN:   -Xlinker one -Xlinker --no-demangle \
-// RUN:   -Wl,two,--no-demangle,three -Xlinker four -z five %s 2> %t
+// RUN:   -Wl,two,--no-demangle,three -Xlinker four -z five -r %s 2> %t
 // RUN: FileCheck -check-prefix=DARWIN < %t %s
 //
 // RUN: %clang -target x86_64-pc-linux-gnu -### \
 // RUN:   -Xlinker one -Xlinker --no-demangle \
-// RUN:   -Wl,two,--no-demangle,three -Xlinker four -z five %s 2> %t
+// RUN:   -Wl,two,--no-demangle,three -Xlinker four -z five -r %s 2> %t
 // RUN: FileCheck -check-prefix=LINUX < %t %s
 //
 // DARWIN-NOT: --no-demangle
-// DARWIN: "one" "two" "three" "four" "-z" "five"
-// LINUX: "--no-demangle" "one" "two" "three" "four" "-z" "five"
+// DARWIN: "one" "two" "three" "four" "-z" "five" "-r"
+// LINUX: "--no-demangle" "one" "two" "three" "four" "-z" "five" "-r"
 
 // Check that we forward '-Xlinker' and '-Wl,' on Windows.
 // RUN: %clang -target i686-pc-win32 -### \