Fix pr20601-1.c on the H8

gcc/
	* config/h8300/testcompare.md (tst_extzv_1_n): Do not accept constants
	for the primary input operand.
	(tstsi_variable_bit_qi): Similarly.

gcc/config/h8300/testcompare.md

@@ -9,7 +9,7 @@
 				  (match_operand 1 "const_int_operand" "n,n,n"))
 		 (const_int 0)))
    (clobber (match_scratch:QI 2 "=X,X,&r"))]
-  ""
+  "!CONSTANT_P (operands[0])"
   "@
    btst\\t%Z1,%Y0
    btst\\t%Z1,%Y0
@@ -82,7 +82,7 @@
 					  (const_int 7)))
 		 (const_int 0)))
    (clobber (match_scratch:QI 2 "=X,X,&r"))]
-  ""
+  "!CONSTANT_P (operands[0])"
   "@
    btst\\t%w1,%X0
    btst\\t%w1,%X0