test: fix copy-paste mistake

Accidental over-quoting of the match string.

llvm-svn: 209058
diff --git a/llvm/test/CodeGen/ARM/Windows/read-only-data.ll b/llvm/test/CodeGen/ARM/Windows/read-only-data.ll
index 965018d..0ccb5ed 100644
--- a/llvm/test/CodeGen/ARM/Windows/read-only-data.ll
+++ b/llvm/test/CodeGen/ARM/Windows/read-only-data.ll
@@ -10,6 +10,6 @@
   ret void
 }
 
-; CHECK: .section ".rdata","rd"
+; CHECK: .section .rdata,"rd"
 ; CHECK-NOT: .section ".rodata.str1.1"