8256986: [PPC64] C2 crashes when accessing nonexisting jvms of CallLeafDirectNode

Reviewed-by: clanger

Author: TheRealMDoerr

src/hotspot/cpu/ppc/ppc.ad

@@ -1115,11 +1115,17 @@ int MachCallDynamicJavaNode::ret_addr_offset() {
 }
 
 int MachCallRuntimeNode::ret_addr_offset() {
+  if (rule() == CallRuntimeDirect_rule) {
+    // CallRuntimeDirectNode uses call_c.
 #if defined(ABI_ELFv2)
-  return 28;
+    return 28;
 #else
-  return 40;
+    return 40;
 #endif
+  }
+  assert(rule() == CallLeafDirect_rule, "unexpected node with rule %u", rule());
+  // CallLeafDirectNode uses bl.
+  return 4;
 }
 
 int MachCallNativeNode::ret_addr_offset() {
@@ -3578,6 +3584,7 @@ encode %{
     call->_tf                = _tf;
     call->_entry_point       = _entry_point;
     call->_cnt               = _cnt;
+    call->_guaranteed_safepoint = true;
     call->_oop_map           = _oop_map;
     call->_jvms              = _jvms;
     call->_jvmadj            = _jvmadj;
@@ -3778,14 +3785,14 @@ encode %{
     call->_tf          = _tf;
     call->_entry_point = _entry_point;
     call->_cnt         = _cnt;
+    call->_guaranteed_safepoint = false;
     call->_oop_map     = _oop_map;
     guarantee(!_jvms, "You must clone the jvms and adapt the offsets by fix_jvms().");
     call->_jvms        = NULL;
     call->_jvmadj      = _jvmadj;
     call->_in_rms      = _in_rms;
     call->_nesting     = _nesting;
 
-
     // New call needs all inputs of old call.
     // Req...
     for (uint i = 0; i < req(); ++i) {