Fix issue in kernarg metadata parsing due to early finalization

The logic to parse the kernel metadata is unaware that enabling
of early finalization could result in multiple code blobs in a
single .kernel section.  This teaches the HIP runtime to handle
that.

Change-Id: I1581b42f0da8b30233d7898014f7468728c1d489

src/program_state.cpp

@@ -590,14 +590,16 @@ unordered_map<string, vector<pair<size_t, size_t>>>& kernargs() {
     static once_flag f;
 
     call_once(f, []() {
-        for (auto&& blob : code_object_blobs()) {
-            stringstream tmp{std::string{
-                blob.second.front().cbegin(), blob.second.front().cend()}};
+        for (auto&& blobs_for_one_arch : code_object_blobs()) {
+            for (auto && blob : blobs_for_one_arch.second)  {
+                stringstream tmp{std::string{
+                    blob.cbegin(), blob.cend()}};
 
-            elfio reader;
-            if (!reader.load(tmp)) continue;
+                    elfio reader;
+                    if (!reader.load(tmp)) continue;
 
-            read_kernarg_metadata(reader, r);
+                    read_kernarg_metadata(reader, r);
+            }
         }
     });