Copy CoreFX FileStream to CoreLib

This copies FileStream to CoreLib and uses it in place of the legacy
FileStream. Code is mostly a direct copy with the addition of a few
internal constructor overloads.

Adds a simple Debug wrapper for BCLDebug to allow keeping the code
the same. Also follows the same pattern for SR wrapping.

Needed to bring down PreAllocatedOverlapped.

- Expose FileStream in model.xml
- Remove native usage of FileStreamAsyncResult
- #ifdef SafeFileHandle creation in existing code (to avoid mismatched
  PAL/CoreFX usage)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/vm/nativeoverlapped.h b/src/vm/nativeoverlapped.h
index 9e4e861790..0c0693dca6 100644
--- a/src/vm/nativeoverlapped.h
+++ b/src/vm/nativeoverlapped.h
@@ -22,6 +22,7 @@ class OverlappedDataObject : public Object
 {
 public:
     ASYNCRESULTREF m_asyncResult;
+
     OBJECTREF m_iocb;
     OBJECTREF m_iocbHelper;
     OBJECTREF m_overlapped;