tcg/ppc64,x86_64: fix constraints of op_qemu_st64

This op only takes two arguments, not two.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

tcg/ppc64/tcg-target.c

@@ -1499,7 +1499,7 @@ static const TCGTargetOpDef ppc_op_defs[] = {
     { INDEX_op_qemu_st8, { "S", "S" } },
     { INDEX_op_qemu_st16, { "S", "S" } },
     { INDEX_op_qemu_st32, { "S", "S" } },
-    { INDEX_op_qemu_st64, { "S", "S", "S" } },
+    { INDEX_op_qemu_st64, { "S", "S" } },
 
     { INDEX_op_ext8s_i32, { "r", "r" } },
     { INDEX_op_ext16s_i32, { "r", "r" } },

tcg/x86_64/tcg-target.c

@@ -1387,7 +1387,7 @@ static const TCGTargetOpDef x86_64_op_defs[] = {
     { INDEX_op_qemu_st8, { "L", "L" } },
     { INDEX_op_qemu_st16, { "L", "L" } },
     { INDEX_op_qemu_st32, { "L", "L" } },
-    { INDEX_op_qemu_st64, { "L", "L", "L" } },
+    { INDEX_op_qemu_st64, { "L", "L" } },
 
     { -1 },
 };