Fix build break from CL# 1544863 (git PR #1946 merge commit 810b116)

[tfs-changeset: 1545107]

Author: Mike McLaughlin

src/debug/daccess/dacfn.cpp

@@ -219,7 +219,7 @@ DacWriteAll(TADDR addr, PVOID buffer, ULONG32 size, bool throwEx)
 }
 
 HRESULT 
-DacVirtualUnwind(DWORD threadId, CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS *contextPointers)
+DacVirtualUnwind(DWORD threadId, PCONTEXT context, PT_KNONVOLATILE_CONTEXT_POINTERS contextPointers)
 {
     if (!g_dacImpl)
     {
@@ -230,7 +230,7 @@ DacVirtualUnwind(DWORD threadId, CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS
     // The DAC code doesn't use these context pointers but zero them out to be safe.
     if (contextPointers != NULL)
     {
-        memset(contextPointers, 0, sizeof(KNONVOLATILE_CONTEXT_POINTERS));
+        memset(contextPointers, 0, sizeof(T_KNONVOLATILE_CONTEXT_POINTERS));
     }
 
     ReleaseHolder<ICorDebugDataTarget4> dt;

src/inc/daccess.h

@@ -663,7 +663,7 @@ HRESULT DacFreeVirtual(TADDR mem, ULONG32 size, ULONG32 typeFlags,
 PVOID   DacInstantiateTypeByAddress(TADDR addr, ULONG32 size, bool throwEx);
 PVOID   DacInstantiateTypeByAddressNoReport(TADDR addr, ULONG32 size, bool throwEx);
 PVOID   DacInstantiateClassByVTable(TADDR addr, ULONG32 minSize, bool throwEx);
-HRESULT DacVirtualUnwind(ULONG32 threadId, CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS *contextPointers);
+HRESULT DacVirtualUnwind(ULONG32 threadId, PCONTEXT context, PT_KNONVOLATILE_CONTEXT_POINTERS contextPointers);
 
 // Copy a null-terminated ascii or unicode string from the target to the host.
 // Note that most of the work here is to find the null terminator.  If you know the exact length,