Add acquire barrier to populate bit reading (#119967)

The setting of the NDirectMethodDesc::kNDirectPopulated bit
is done via an interlocked operation. This bit is used to indicate
if the NDirectMethodDesc has been populated with the needed
information to load the P/Invoke. The reading of this bit however
was missing an acquire barrier and thus setting of fields between
the check and set weren't being observed correctly.

Co-authored-by: Aaron R Robinson <arobins@microsoft.com>

Author: github-actions[bot]

src/coreclr/vm/method.hpp

@@ -2959,7 +2959,7 @@ class NDirectMethodDesc : public MethodDesc
     BOOL IsPopulated()
     {
         LIMITED_METHOD_CONTRACT;
-        return (ndirect.m_wFlags & kNDirectPopulated) != 0;
+        return (VolatileLoad(&ndirect.m_wFlags) & kNDirectPopulated) != 0;
     }
 
     ULONG DefaultDllImportSearchPathsAttributeCachedValue()