TargetLibraryInfo: add strn?cat, strn?cpy, and strn?len

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160678 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetLibraryInfo.cpp b/lib/Target/TargetLibraryInfo.cpp
index ec95ad4..898c0e7 100644
--- a/lib/Target/TargetLibraryInfo.cpp
+++ b/lib/Target/TargetLibraryInfo.cpp
@@ -108,6 +108,12 @@
     "sqrt",
     "sqrtl",
     "sqrtf",
+    "strcat",
+    "strcpy",
+    "strlen",
+    "strncat",
+    "strncpy",
+    "strnlen",
     "tan",
     "tanl",
     "tanf",