8264016: [JVMCI] add some thread local fields for use by JVMCI

Reviewed-by: dholmes, iklam, coleenp

Author: Tom Rodriguez

src/hotspot/share/jvmci/vmStructs_jvmci.cpp

@@ -182,6 +182,9 @@
   nonstatic_field(JavaThread,                  _pending_failed_speculation,                   jlong)                                 \
   nonstatic_field(JavaThread,                  _pending_transfer_to_interpreter,              bool)                                  \
   nonstatic_field(JavaThread,                  _jvmci_counters,                               jlong*)                                \
+  nonstatic_field(JavaThread,                  _jvmci_reserved0,                              intptr_t*)                             \
+  nonstatic_field(JavaThread,                  _jvmci_reserved1,                              intptr_t*)                             \
+  nonstatic_field(JavaThread,                  _jvmci_reserved_oop0,                          oop)                                   \
   nonstatic_field(JavaThread,                  _should_post_on_exceptions_flag,               int)                                   \
   nonstatic_field(JavaThread,                  _jni_environment,                              JNIEnv)                                \
   nonstatic_field(JavaThread,                  _stack_overflow_state._reserved_stack_activation, address)                            \

src/hotspot/share/runtime/thread.cpp

@@ -1202,6 +1202,9 @@ JavaThread::JavaThread() :
   _pending_failed_speculation(0),
   _jvmci{nullptr},
   _jvmci_counters(nullptr),
+  _jvmci_reserved0(nullptr),
+  _jvmci_reserved1(nullptr),
+  _jvmci_reserved_oop0(nullptr),
 #endif // INCLUDE_JVMCI
 
   _exception_oop(oop()),
@@ -2310,6 +2313,9 @@ void JavaThread::oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf) {
   f->do_oop((oop*) &_vm_result);
   f->do_oop((oop*) &_exception_oop);
   f->do_oop((oop*) &_pending_async_exception);
+#if INCLUDE_JVMCI
+  f->do_oop((oop*) &_jvmci_reserved_oop0);
+#endif
 
   if (jvmti_thread_state() != NULL) {
     jvmti_thread_state()->oops_do(f, cf);

src/hotspot/share/runtime/thread.hpp

@@ -1024,6 +1024,11 @@ class JavaThread: public Thread {
   // Support for high precision, thread sensitive counters in JVMCI compiled code.
   jlong*    _jvmci_counters;
 
+  // Fast thread locals for use by JVMCI
+  intptr_t*  _jvmci_reserved0;
+  intptr_t*  _jvmci_reserved1;
+  oop        _jvmci_reserved_oop0;
+
  public:
   static jlong* _jvmci_old_thread_counters;
   static void collect_counters(jlong* array, int length);