8260899: ARM32: SyncOnValueBasedClassTest fails with assert(is_valid()) failed: invalid register

Reviewed-by: dsamersoff

Author: shipilev

src/hotspot/cpu/arm/c1_MacroAssembler_arm.cpp

@@ -205,9 +205,9 @@ int C1_MacroAssembler::lock_object(Register hdr, Register obj,
   null_check_offset = offset();
 
   if (DiagnoseSyncOnValueBasedClasses != 0) {
-    load_klass(tmp1, obj);
-    ldr_u32(tmp1, Address(tmp1, Klass::access_flags_offset()));
-    tst(tmp1, JVM_ACC_IS_VALUE_BASED_CLASS);
+    load_klass(tmp2, obj);
+    ldr_u32(tmp2, Address(tmp2, Klass::access_flags_offset()));
+    tst(tmp2, JVM_ACC_IS_VALUE_BASED_CLASS);
     b(slow_case, ne);
   }