8255233: InterpreterRuntime::at_unwind should be a JRT_LEAF

Reviewed-by: coleenp, dholmes

src/hotspot/cpu/aarch64/interp_masm_aarch64.cpp

@@ -551,7 +551,9 @@ void InterpreterMacroAssembler::remove_activation(
   br(Assembler::AL, fast_path);
   bind(slow_path);
   push(state);
-  call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind));
+  set_last_Java_frame(esp, rfp, (address)pc(), rscratch1);
+  super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind), rthread);
+  reset_last_Java_frame(true);
   pop(state);
   bind(fast_path);
 

src/hotspot/cpu/x86/interp_masm_x86.cpp

@@ -1003,7 +1003,9 @@ void InterpreterMacroAssembler::remove_activation(
   jmp(fast_path);
   bind(slow_path);
   push(state);
-  call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind));
+  set_last_Java_frame(rthread, noreg, rbp, (address)pc());
+  super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind), rthread);
+  reset_last_Java_frame(rthread, true);
   pop(state);
   NOT_LP64(get_thread(rthread);) // call_VM clobbered it, restore
   bind(fast_path);

src/hotspot/share/interpreter/interpreterRuntime.cpp

@@ -1172,10 +1172,7 @@ JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
   }
 JRT_END
 
-JRT_ENTRY(void, InterpreterRuntime::at_unwind(JavaThread* thread))
-  // JRT_END does an implicit safepoint check, hence we are guaranteed to block
-  // if this is called during a safepoint
-
+JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* thread))
   // This function is called by the interpreter when the return poll found a reason
   // to call the VM. The reason could be that we are returning into a not yet safe
   // to access frame. We handle that below.