Make STATIC_CHAIN_REGNUM a call used register.

	* config/v850/v850.h (STATIC_CHAIN_REGNUM): Change to r19.
	* config/v850/v850.c (v850_asm_trampoline_template): Update
	accordingly.

gcc/ChangeLog

+2020-02-28  Jeff Law  <law@redhat.com>
+
+	* config/v850/v850.h (STATIC_CHAIN_REGNUM): Change to r19.
+	* config/v850/v850.c (v850_asm_trampoline_template): Update
+	accordingly.
+
 2020-02-28  Michael Meissner  <meissner@linux.ibm.com>
 
 	PR target/93937

gcc/config/v850/v850.c

@@ -2961,7 +2961,7 @@ static void
 v850_asm_trampoline_template (FILE *f)
 {
   fprintf (f, "\tjarl .+4,r12\n");
-  fprintf (f, "\tld.w 12[r12],r20\n");
+  fprintf (f, "\tld.w 12[r12],r19\n");
   fprintf (f, "\tld.w 16[r12],r12\n");
   fprintf (f, "\tjmp [r12]\n");
   fprintf (f, "\tnop\n");

gcc/config/v850/v850.h

@@ -438,8 +438,9 @@ enum reg_class
 /* Base register for access to arguments of the function.  */
 #define ARG_POINTER_REGNUM 35
 
-/* Register in which static-chain is passed to a function.  */
-#define STATIC_CHAIN_REGNUM 20
+/* Register in which static-chain is passed to a function.
+   This must be a call used register.  */
+#define STATIC_CHAIN_REGNUM 19
 
 /* If defined, this macro specifies a table of register pairs used to
    eliminate unneeded registers that point into the stack frame.  If