SWDEV-1 - Fix illegal atomic initialization

See https://stackoverflow.com/a/21710850 for an extensive discussion.

This is a cherry-pick from a github pull request:
https://github.com/ROCm-Developer-Tools/ROCclr/pull/29

Change-Id: I87a58548d2995ab51a7cd6e684b5442e5b300923


[ROCm/clr commit: ebfa343827]

projects/clr/rocclr/platform/memory.cpp

@@ -29,7 +29,7 @@
 #include <atomic>
 
 // Stores the no. of memory allocations
-std::atomic<uint32_t> numAllocs = 0;
+std::atomic<uint32_t> numAllocs = {0};
 
 namespace amd {