diff -r d99af76d7689 -r d8902e9c307c src/hotspot/share/jvmci/jvmciCompiler.cpp
--- a/src/hotspot/share/jvmci/jvmciCompiler.cpp	Sat Sep 07 10:05:47 2019 -0700
+++ b/src/hotspot/share/jvmci/jvmciCompiler.cpp	Sat Sep 07 18:48:57 2019 -0400
@@ -50,6 +50,7 @@
 }
 
 void JVMCICompiler::bootstrap(TRAPS) {
+  assert(THREAD->is_Java_thread(), "must be");
   if (Arguments::mode() == Arguments::_int) {
     // Nothing to do in -Xint mode
     return;
@@ -80,7 +81,7 @@
   do {
     // Loop until there is something in the queue.
     do {
-      os::sleep(THREAD, 100, true);
+      os::sleep((JavaThread*)THREAD, 100);
       qsize = CompileBroker::queue_size(CompLevel_full_optimization);
     } while (!_bootstrap_compilation_request_handled && first_round && qsize == 0);
     first_round = false;