target/rx: TCG translation

This part only supported RXv1 instructions.

Instruction manual:
  https://www.renesas.com/us/en/doc/products/mpumcu/doc/rx_family/r01us0032ej0120_rxsm.pdf

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200224141923.82118-5-ysato@users.sourceforge.jp>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

target/rx/Makefile.objs

@@ -0,0 +1,12 @@
+obj-y += translate.o op_helper.o helper.o cpu.o gdbstub.o disas.o
+obj-$(CONFIG_SOFTMMU) += monitor.o
+
+DECODETREE = $(SRC_PATH)/scripts/decodetree.py
+
+target/rx/decode.inc.c: \
+  $(SRC_PATH)/target/rx/insns.decode $(DECODETREE)
+	$(call quiet-command,\
+	  $(PYTHON) $(DECODETREE) --varinsnwidth 32 -o $@ $<, "GEN", $(TARGET_DIR)$@)
+
+target/rx/translate.o: target/rx/decode.inc.c
+target/rx/disas.o: target/rx/decode.inc.c