Bug 1813624 - Remove old IonBuilder warmup heuristic r=jandem

This was added in this [1] commit, but the actual purpose and intent have been
lost, though the comment has nevertheless survived.

[1]: https://hg.mozilla.org/mozilla-central/rev/251540232d8f8890458446fcb2e89f8a87b02cd7

Differential Revision: https://phabricator.services.mozilla.com/D168288

js/src/jit/CodeGenerator.cpp

@@ -13304,10 +13304,6 @@ bool CodeGenerator::link(JSContext* cx, const WarpSnapshot* snapshot) {
     return false;
   }
 
-  // Check to make sure we didn't have a mid-build invalidation. If so, we
-  // will trickle to jit::Compile() and return Method_Skipped.
-  uint32_t warmUpCount = script->getWarmUpCount();
-
   IonCompilationId compilationId =
       cx->runtime()->jitRuntime()->nextCompilationId();
   JitZone* jitZone = cx->zone()->jitZone();
@@ -13329,14 +13325,6 @@ bool CodeGenerator::link(JSContext* cx, const WarpSnapshot* snapshot) {
     return true;
   }
 
-  // IonMonkey could have inferred better type information during
-  // compilation. Since adding the new information to the actual type
-  // information can reset the usecount, increase it back to what it was
-  // before.
-  if (warmUpCount > script->getWarmUpCount()) {
-    script->incWarmUpCounter(warmUpCount - script->getWarmUpCount());
-  }
-
   uint32_t argumentSlots = (gen->outerInfo().nargs() + 1) * sizeof(Value);
 
   // We encode safepoints after the OSI-point offsets have been determined.