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

Port e425079b

Minor fix to the s390 port.

Original Commit Message:

    arguments.h is one of the headers including objects-inl.h. Files needing
    objects-inl.h used to innocently pull in debug.h, so that needs to be fixed now
    too.

R=marja@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:5294
LOG=N

Review-Url: https://codereview.chromium.org/2687103002
Cr-Commit-Position: refs/heads/master@{#43073}

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.