8256359: AArch64: runtime/ReservedStack/ReservedStackTestCompiler.java fails

Reviewed-by: yan
Backport-of: 4e43b28

Author: Sergey Nazarkin

src/hotspot/cpu/aarch64/interp_masm_aarch64.cpp

@@ -654,14 +654,16 @@ void InterpreterMacroAssembler::remove_activation(
 
   // remove activation
   // get sender esp
-  ldr(esp,
+  ldr(rscratch2,
       Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize));
   if (StackReservedPages > 0) {
     // testing if reserved zone needs to be re-enabled
     Label no_reserved_zone_enabling;
 
+    // look for an overflow into the stack reserved zone, i.e.
+    // interpreter_frame_sender_sp <= JavaThread::reserved_stack_activation
     ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
-    cmp(esp, rscratch1);
+    cmp(rscratch2, rscratch1);
     br(Assembler::LS, no_reserved_zone_enabling);
 
     call_VM_leaf(
@@ -672,6 +674,9 @@ void InterpreterMacroAssembler::remove_activation(
 
     bind(no_reserved_zone_enabling);
   }
+
+  // restore sender esp
+  mov(esp, rscratch2);
   // remove frame anchor
   leave();
   // If we're returning to interpreted code we will shortly be