Bug 1087245 part 1 - Allow replace-malloc libraries to register debug file handles to poison IO interposer. r=nfroyd

xpcom/build/PoisonIOInterposerMac.cpp

@@ -32,6 +32,10 @@
 #include <dlfcn.h>
 #include <fcntl.h>
 
+#ifdef MOZ_REPLACE_MALLOC
+#include "replace_malloc_bridge.h"
+#endif
+
 namespace {
 
 using namespace mozilla;
@@ -342,6 +346,14 @@ InitPoisonIOInterposer()
   MozillaRegisterDebugFD(1);
   MozillaRegisterDebugFD(2);
 
+#ifdef MOZ_REPLACE_MALLOC
+  // The contract with InitDebugFd is that the given registry can be used
+  // at any moment, so the instance needs to persist longer than the scope
+  // of this functions.
+  static DebugFdRegistry registry;
+  ReplaceMalloc::InitDebugFd(registry);
+#endif
+
   for (int i = 0; i < NumFunctions; ++i) {
     FuncData* d = Functions[i];
     if (!d->Function) {