s390: [iwyu] Remove include debug.h -> arguments.h

src/s390/assembler-s390.h

Index: src/s390/assembler-s390.h
diff --git a/src/s390/assembler-s390.h b/src/s390/assembler-s390.h
index 0d5fc3a857091e07481b24761878adb97eb2f1c5..04dafde207caa38307a7c0fb570def69c25a5bce 100644
--- a/src/s390/assembler-s390.h
+++ b/src/s390/assembler-s390.h
@@ -448,9 +448,9 @@ class Assembler : public AssemblerBase {
       Isolate* isolate, Address pc, Address constant_pool, Address target,
       ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED));
   INLINE(static Address target_address_at(Address pc, Code* code));
-  INLINE(static void set_target_address_at(Isolate* isolate, Address pc,
-                                           Code* code, Address target,
-                                           ICacheFlushMode icache_flush_mode));
+  INLINE(static void set_target_address_at(
+      Isolate* isolate, Address pc, Code* code, Address target,
+      ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED));
 
   // Return the code target address at a call site from the return address
   // of that call in the instruction stream.