[ARC] Pass along "-mcode-density" flag to "as"

This change makes sure that if the driver is invoked with
"-mcode-density" flag, then the assembler will receive it
too.

gcc/
xxxx-xx-xx  Shahab Vahedi  <shahab@synopsys.com>

        * config/arc/arc.h (ASM_SPEC): pass -mcode-density

From-SVN: r276453

gcc/ChangeLog

+2019-10-02  Shahab Vahedi  <shahab@synopsys.com>
+
+	* config/arc/arc.h (ASM_SPEC): Pass -mcode-density.
+
 2019-10-02  Richard Biener  <rguenther@suse.de>
 
 	* tree-vectorizer.h (vect_transform_reduction): Declare.

gcc/config/arc/arc.h

@@ -97,7 +97,8 @@ extern const char *arc_cpu_to_as (int argc, const char **argv);
 
 #undef ASM_SPEC
 #define ASM_SPEC  "%{mbig-endian|EB:-EB} %{EL} "			\
-  "%:cpu_to_as(%{mcpu=*:%*}) %{mspfp*} %{mdpfp*} %{mfpu=fpuda*:-mfpuda}"
+  "%:cpu_to_as(%{mcpu=*:%*}) %{mspfp*} %{mdpfp*} "                      \
+  "%{mfpu=fpuda*:-mfpuda} %{mcode-density}"
 
 #define OPTION_DEFAULT_SPECS						\
   {"cpu", "%{!mcpu=*:%{!mARC*:%{!marc*:%{!mA7:%{!mA6:-mcpu=%(VALUE)}}}}}" }