Bug 1804499 - [4/4] Expose allocator's stall-specs beyond mozjemalloc.cpp r=glandium

Export `GetStallSpecs` as `mozilla::GetAllocatorStallSpecs`, when it exists.

Differential Revision: https://phabricator.services.mozilla.com/D165430

memory/build/mozjemalloc.cpp

@@ -1573,6 +1573,13 @@ static inline StallSpecs GetStallSpecs() {
 }  // namespace MozAllocRetries
 
 using MozAllocRetries::MozVirtualAlloc;
+
+namespace mozilla {
+MOZ_JEMALLOC_API StallSpecs GetAllocatorStallSpecs() {
+  return ::MozAllocRetries::GetStallSpecs();
+}
+}  // namespace mozilla
+
 #endif  // XP_WIN
 
 // ***************************************************************************

memory/build/mozmemory_utils.h

@@ -10,6 +10,10 @@
 #include <optional>
 #include <type_traits>
 
+#if defined(MOZ_MEMORY) && defined(XP_WIN)
+#  include "mozmemory_wrap.h"
+#endif
+
 namespace mozilla {
 
 namespace detail {
@@ -62,6 +66,10 @@ struct StallSpecs {
   }
 };
 
+#if defined(MOZ_MEMORY) && defined(XP_WIN)
+MOZ_JEMALLOC_API StallSpecs GetAllocatorStallSpecs();
+#endif
+
 }  // namespace mozilla
 
 #endif  // mozjemalloc_utils_h