Add acquire barrier to populate bit reading (#117523)

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.

Author: AaronRobinsonMSFT

src/coreclr/vm/method.hpp

@@ -3180,7 +3180,7 @@ class NDirectMethodDesc : public MethodDesc
     BOOL IsPopulated()
     {
         LIMITED_METHOD_CONTRACT;
-        return (ndirect.m_wFlags & kNDirectPopulated) != 0;
+        return (VolatileLoad(&ndirect.m_wFlags) & kNDirectPopulated) != 0;
     }
 
     ULONG DefaultDllImportSearchPathsAttributeCachedValue()