[OpenMP] Delete tests in openmp-offload.c which cuase failures
until a better way to perform these tests is figured out.

Change connected to diff: D29654

llvm-svn: 310625
diff --git a/clang/lib/Driver/ToolChains/Cuda.cpp b/clang/lib/Driver/ToolChains/Cuda.cpp
index 643c340..00715a7 100644
--- a/clang/lib/Driver/ToolChains/Cuda.cpp
+++ b/clang/lib/Driver/ToolChains/Cuda.cpp
@@ -527,10 +527,14 @@
     }
 
     StringRef Arch = DAL->getLastArgValue(options::OPT_march_EQ);
-    if (Arch.empty())
-      // Default compute capability for CUDA toolchain is sm_20.
+    if (Arch.empty()) {
+      // Default compute capability for CUDA toolchain is the
+      // lowest compute capability supported by the installed
+      // CUDA version.
       DAL->AddJoinedArg(nullptr,
-          Opts.getOption(options::OPT_march_EQ), "sm_20");
+          Opts.getOption(options::OPT_march_EQ),
+          CudaInstallation.getLowestExistingArch());
+    }
 
     return DAL;
   }