Don't ignore -Xstacktracefile: in debug builds.

Change-Id: Iabf65f6b68fda8a23c480c5c427c3f87a98d6d85
diff --git a/src/runtime.cc b/src/runtime.cc
index b5928b2..79f75c7 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -492,11 +492,7 @@
     } else if (StartsWith(option, "-Xlockprofthreshold:")) {
       parsed->lock_profiling_threshold_ = ParseIntegerOrDie(option);
     } else if (StartsWith(option, "-Xstacktracefile:")) {
-      if (kIsDebugBuild) {
-        // Ignore the zygote and always show stack traces in debug builds.
-      } else {
-        parsed->stack_trace_file_ = option.substr(strlen("-Xstacktracefile:"));
-      }
+      parsed->stack_trace_file_ = option.substr(strlen("-Xstacktracefile:"));
     } else if (option == "sensitiveThread") {
       parsed->hook_is_sensitive_thread_ = reinterpret_cast<bool (*)()>(options[i].second);
     } else if (option == "vfprintf") {