Propagate the CUDA toolkit directory into the lit tests

Allows the tests to actually run... :D

tests/hipify-clang/axpy.cu

@@ -1,4 +1,4 @@
-// RUN: hipify "%s" -o=%t --
+// RUN: hipify "%s" -o=%t -- %cuda_args
 
 #include <iostream>
 

tests/hipify-clang/lit.cfg

@@ -46,3 +46,5 @@ if obj_root is not None:
 
 config.substitutions.append(("hipify", obj_root+"/hipify-clang"))
 
+# Clang args for CUDA...
+config.substitutions.append(("%cuda_args", "-x cuda --cuda-path=%s --cuda-gpu-arch=sm_30" % config.cuda_root))

tests/hipify-clang/lit.site.cfg.in

@@ -2,6 +2,7 @@ import sys
 
 config.llvm_tools_dir = "@LLVM_TOOLS_BINARY_DIR@"
 config.obj_root = "@BINARY_DIR@"
+config.cuda_root = "@CUDA_TOOLKIT_ROOT_DIR@"
 
 # Support substitution of the tools and libs dirs with user parameters. This is
 # used when we can't determine the tool dir at configuration time.