Revert "gcstress: Limit the number of unwinds."

This reverts commit 52c7e98efe104bfe77b07f7c2c8c778996db02f4.

Reason for revert: Investigating timeout issues.

Bug: 142039427
Change-Id: I6e158e1db94eca3de4603aab9eff51824291cb87
diff --git a/runtime/backtrace_helper.cc b/runtime/backtrace_helper.cc
index 08d67cd..2d39270 100644
--- a/runtime/backtrace_helper.cc
+++ b/runtime/backtrace_helper.cc
@@ -81,19 +81,11 @@
 };
 
 void BacktraceCollector::Collect() {
-  // HACK(b/142039427): Limit the number of unwinds while we diagnose timeout issues.
-  static uint32_t s_count = 0;
-  if (s_count > 1000) {
-    return;
-  }
-  s_count++;
-
   if (!CollectImpl()) {
     // Reparse process mmaps to detect newly loaded libraries and retry.
     UnwindHelper::Get(Thread::Current(), max_depth_)->Reparse();
     if (!CollectImpl()) {
       // Failed to unwind stack. Ignore for now.
-      s_count = std::numeric_limits<uint32_t>::max();  // Prevent future unwinds.
     }
   }
 }