Enable GCToOSInterface to be defined on the GC side of the GC interface (#8121)

* Re-introduce changes lost in a merge conflict

* Enable GCToOSInterface to be defined behind the GC interface
when building the GC in standalone mode. Provide a skeleton Windows
implementation and the framework for a Unix implementation.

* Address code review feedback

1 files changed, 8 insertions, 2 deletions

diff --git a/src/vm/gcenv.os.cpp b/src/vm/gcenv.os.cpp
index 30b72cbba1..896dce6e40 100644
--- a/src/vm/gcenv.os.cpp
+++ b/src/vm/gcenv.os.cpp
@@ -18,6 +18,12 @@
 #include <Psapi.h>
 #endif
 
+#ifdef Sleep
+#undef Sleep
+#endif // Sleep
+
+#include "env/gcenv.os.h"
+
 #define MAX_PTR ((uint8_t*)(~(ptrdiff_t)0))
 
 // Initialize the interface implementation
@@ -160,7 +166,7 @@ void GCToOSInterface::YieldThread(uint32_t switchCount)
 //  flags     - flags to control special settings like write watching
 // Return:
 //  Starting virtual address of the reserved range
-void* GCToOSInterface::VirtualReserve(void* address, size_t size, size_t alignment, uint32_t flags)
+void* GCToOSInterface::VirtualReserve(size_t size, size_t alignment, uint32_t flags)
 {
     LIMITED_METHOD_CONTRACT;
 
@@ -249,7 +255,7 @@ bool GCToOSInterface::SupportsWriteWatch()
     // check if the OS supports write-watch. 
     // Drawbridge does not support write-watch so we still need to do the runtime detection for them.
     // Otherwise, all currently supported OSes do support write-watch.
-    void* mem = VirtualReserve (0, g_SystemInfo.dwAllocationGranularity, 0, VirtualReserveFlags::WriteWatch);
+    void* mem = VirtualReserve (g_SystemInfo.dwAllocationGranularity, 0, VirtualReserveFlags::WriteWatch);
     if (mem != NULL)
     {
         VirtualRelease (mem, g_SystemInfo.dwAllocationGranularity);