Release host buffers after segment freeze.

Release staging buffers after loading has completed.  The debugger
no longer uses this copy.

Change-Id: I46f36b50033bebe5a9ebc648b291d46f1d09b21d


[ROCm/ROCR-Runtime commit: 03a52655a8]

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_loader_context.cpp

@@ -358,6 +358,10 @@ bool RegionMemory::Freeze() {
     memcpy(ptr_, host_ptr_, size_);
   }
 
+  // Free host buffer
+  HSA::hsa_memory_free(host_ptr_);
+  host_ptr_ = nullptr;
+
   // Invalidate agent caches which may hold lines of the new allocation.
   if (is_code_ && (region_->owner()->device_type() == core::Agent::kAmdGpuDevice))
     ((AMD::GpuAgent*)region_->owner())->InvalidateCodeCaches();