[OpenMP] Enable executable lookup into driver directory.

Summary: Invoking the compiler inside a script causes the clang-offload-bundler executable to not be found. This patch enables the lookup for executables in the driver directory where the clang-offload-bundler resides.

Reviewers: hfinkel, carlo.bertolli, arpith-jacob, ABataev, caomhin

Reviewed By: hfinkel

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D36537

llvm-svn: 310513
diff --git a/clang/lib/Driver/ToolChains/Cuda.cpp b/clang/lib/Driver/ToolChains/Cuda.cpp
index b6a7b82..41185ed 100644
--- a/clang/lib/Driver/ToolChains/Cuda.cpp
+++ b/clang/lib/Driver/ToolChains/Cuda.cpp
@@ -438,6 +438,9 @@
       CudaInstallation(D, HostTC.getTriple(), Args), OK(OK) {
   if (CudaInstallation.isValid())
     getProgramPaths().push_back(CudaInstallation.getBinPath());
+  // Lookup binaries into the driver directory, this is used to
+  // discover the clang-offload-bundler executable.
+  getProgramPaths().push_back(getDriver().Dir);
 }
 
 void CudaToolChain::addClangTargetOptions(