Handle FIELD_DECL in IPA ICF.

2019-11-14  Martin Liska  <mliska@suse.cz>

	* ipa-icf-gimple.c (func_checker::hash_operand): Improve
	func_checker::hash_operand by handling of FIELD_DECLs.

From-SVN: r278208

gcc/ChangeLog

 2019-11-14  Martin Liska  <mliska@suse.cz>
 
+	* ipa-icf-gimple.c (func_checker::hash_operand): Improve
+	func_checker::hash_operand by handling of FIELD_DECLs.
+
+2019-11-14  Martin Liska  <mliska@suse.cz>
+
 	* ipa-icf-gimple.h (func_checker::func_checker): Add
 	default constructor.
 	* ipa-icf.c (sem_function::init): Make operand_equal_p

gcc/ipa-icf-gimple.c

@@ -234,7 +234,10 @@ func_checker::hash_operand (const_tree arg, inchash::hash &hstate,
     case CONST_DECL:
     case SSA_NAME:
       return;
-
+    case FIELD_DECL:
+      inchash::add_expr (DECL_FIELD_OFFSET (arg), hstate, flags);
+      inchash::add_expr (DECL_FIELD_BIT_OFFSET (arg), hstate, flags);
+      return;
     default:
       break;
     }