re PR tree-optimization/87926 (bad array-index warning breaks --disable-checking bootstrap)

	PR 87926
	* Makefile.in (bitmap.o-warn): Use -Wno-error=array-bounds.

From-SVN: r266319

gcc/ChangeLog

+2018-11-20  Nathan Sidwell  <nathan@acm.org>
+
+	PR 87926
+	* Makefile.in (bitmap.o-warn): Use -Wno-error=array-bounds.
+
 2018-11-20  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR lto/87997

gcc/Makefile.in

@@ -221,7 +221,7 @@ libgcov-merge-tool.o-warn = -Wno-error
 gimple-match.o-warn = -Wno-unused
 generic-match.o-warn = -Wno-unused
 dfp.o-warn = -Wno-strict-aliasing
-bitmap.o-warn = -Wno-error # PR 87926
+bitmap.o-warn = -Wno-error=array-bounds # PR 87926
 
 # All warnings have to be shut off in stage1 if the compiler used then
 # isn't gcc; configure determines that.  WARN_CFLAGS will be either