Add support for sqrt, sqrtl, and sqrtf in TargetLibraryInfo.  Disable 
(fptrunc (sqrt (fpext x))) -> (sqrtf x) transformation if -fno-builtin is 
specified.
rdar://10466410

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145460 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetLibraryInfo.cpp b/lib/Target/TargetLibraryInfo.cpp
index aa2e014..d6dbde5 100644
--- a/lib/Target/TargetLibraryInfo.cpp
+++ b/lib/Target/TargetLibraryInfo.cpp
@@ -28,6 +28,9 @@
     "memset_pattern16",
     "iprintf",
     "siprintf",
+    "sqrt",
+    "sqrtl",
+    "sqrtf",
     "fiprintf",
     "fwrite",
     "fputs"