Revert D41478154: Multisect successfully blamed D41478154 for test or…

… build failures

Summary:
This diff is reverting D41478154 (bca372d)
D41478154 (bca372d) has been identified to be causing the following test or build failures:
Tests affected:
- https://www.internalfb.com/intern/test/281475050179222/
- https://www.internalfb.com/intern/test/281475050179220/

Here's the Multisect link:
https://www.internalfb.com/intern/testinfra/multisect/1431791
Here are the tasks that are relevant to this breakage:
T93275607: 2 tests started failing for oncall async_tier in the last 2 weeks
We're generating a revert to back out the changes in this diff, please note the backout may land if someone accepts it.

Differential Revision: D41523287

fbshipit-source-id: c20ef74ea52d400c6d40f8bd8bba9351f3109fa0

folly/io/async/Request.cpp

@@ -17,7 +17,6 @@
 #include <folly/io/async/Request.h>
 
 #include <folly/GLog.h>
-#include <folly/Indestructible.h>
 #include <folly/MapUtil.h>
 #include <folly/experimental/SingleWriterFixedHashMap.h>
 #include <folly/synchronization/Hazptr.h>
@@ -655,8 +654,8 @@ RequestContext::setShallowCopyContext() {
 /* static */ RequestContext* RequestContext::get() {
   auto& context = getStaticContext().requestContext;
   if (!context) {
-    static Indestructible<RequestContext> defaultContext{0};
-    return defaultContext.get();
+    static RequestContext defaultContext(0);
+    return std::addressof(defaultContext);
   }
   return context.get();
 }