Add support for subdirectories in input names

Comgr's amd_comgr_set_data_name() currently has no stated
restrictions on provided names. However, previously names
with a "/" would generate a file-not-found error when set
as an output file name for clang-driver commands due to
missing subdirectories.

In this patch we update Comgr to generate these
subdirectories before executing clang-driver commands.

Change-Id: I39414ad8c336f196f94974dd13c025e4e7963e64

lib/comgr/src/comgr-compiler.cpp

@@ -531,6 +531,14 @@ static bool executeAssembler(AssemblerInvocation &Opts,
 static SmallString<128> getFilePath(DataObject *Object, StringRef Dir) {
   SmallString<128> Path(Dir);
   path::append(Path, Object->Name);
+
+  // Create directories specified in the File Path so that the in-process driver
+  // can successfully execute clang commands that use this file path as an
+  // output argument
+  if (fs::create_directories(path::parent_path(Path))) {
+    return SmallString<128>();
+  }
+
   return Path;
 }