RFR: 8250548: libgraal can deadlock in -Xcomp mode

[Doug Simon]

Please review this bug fix for a deadlock in libgraal under Xcomp.

BUG:
https://bugs.openjdk.java.net/browse/JDK-8250548

PATCH:

diff -r 1f37a5cd6afc src/hotspot/share/compiler/compileBroker.cpp
--- a/src/hotspot/share/compiler/compileBroker.cpp      Fri Jul 24 11:00:50 2020 -0400
+++ b/src/hotspot/share/compiler/compileBroker.cpp      Fri Jul 24 18:52:30 2020 +0200
@@ -1655,7 +1655,7 @@
   bool free_task;
 #if INCLUDE_JVMCI
   AbstractCompiler* comp = compiler(task->comp_level());
-  if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
+  if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
     // It may return before compilation is completed.
     free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
   } else


Testing: hs-tier1,hs-tier2,hs-tier3-graal

-Doug