Fix Clang-tidy readability-redundant-string-cstr warnings

Reviewers: beanz, lattner, jlebar

Subscribers: jholewinski, llvm-commits, mehdi_amini

Differential Revision: https://reviews.llvm.org/D26235

llvm-svn: 285832
diff --git a/llvm/tools/lto/lto.cpp b/llvm/tools/lto/lto.cpp
index 64014e5..2a6585f 100644
--- a/llvm/tools/lto/lto.cpp
+++ b/llvm/tools/lto/lto.cpp
@@ -153,7 +153,7 @@
       attrs.append(MAttrs[i]);
     }
 
-    CG->setAttr(attrs.c_str());
+    CG->setAttr(attrs);
   }
 
   if (OptLevel < '0' || OptLevel > '3')