rocr: Ensure globals are initialized at first use

When ROCr is built as a static library, global variables
were often not initialized to valid values at their first
use. This change addresses that problem.

Change-Id: I550fa41feb3bc04b9cc686bcfb4acf2a7b651a88

runtime/hsa-runtime/core/common/shared.cpp

@@ -44,7 +44,6 @@
 
 namespace rocr {
 namespace core {
-std::function<void*(size_t, size_t, uint32_t, int)> BaseShared::allocate_ = nullptr;
-std::function<void(void*)> BaseShared::free_ = nullptr;
+
 }   // namespace core
 }   // namespace rocr