Use the range variant of find instead of unpacking begin/end

If the result of the find is only used to compare against end(), just
use is_contained instead.

No functionality change is intended.

llvm-svn: 278433
diff --git a/llvm/unittests/Support/ThreadPool.cpp b/llvm/unittests/Support/ThreadPool.cpp
index 69a24bc..8e03aac 100644
--- a/llvm/unittests/Support/ThreadPool.cpp
+++ b/llvm/unittests/Support/ThreadPool.cpp
@@ -31,16 +31,14 @@
   bool isUnsupportedOSOrEnvironment() {
     Triple Host(Triple::normalize(sys::getProcessTriple()));
 
-    if (std::find(UnsupportedEnvironments.begin(), UnsupportedEnvironments.end(),
-                  Host.getEnvironment()) != UnsupportedEnvironments.end())
+    if (find(UnsupportedEnvironments, Host.getEnvironment()) !=
+        UnsupportedEnvironments.end())
       return true;
 
-    if (std::find(UnsupportedOSs.begin(), UnsupportedOSs.end(), Host.getOS())
-        != UnsupportedOSs.end())
+    if (is_contained(UnsupportedOSs, Host.getOS()))
       return true;
 
-    if (std::find(UnsupportedArchs.begin(), UnsupportedArchs.end(), Host.getArch())
-        != UnsupportedArchs.end())
+    if (is_contained(UnsupportedArchs, Host.getArch()))
       return true;
 
     return false;