tcctest: restore & combine

Revert 199369b
- generating test.ref with tcc makes little sense.
- combine riscv_asm & conversion tests into only two files.

too many files are bad ...

Author: grischka

tests/Makefile

@@ -110,8 +110,8 @@ libtcc_test_mt$(EXESUF): libtcc_test_mt.c
 
 # test.ref - generate using cc
 test.ref: tcctest.c
-	$(TCC) $(TCCFLAGS) -w -o tcctest.tcc$(EXESUF) $<
-	./tcctest.tcc$(EXESUF) > $@
+	$(CC) -o tcctest.gcc$(EXESUF) $< $(CFLAGS) -w -O0 -std=gnu99 -fno-omit-frame-pointer
+	./tcctest.gcc$(EXESUF) > $@
 
 # auto test
 test1 test1b: tcctest.c test.ref

tests/tcctest.c

@@ -1175,7 +1175,7 @@ void char_short_test()
     var4 = 0x11223344aa998877ULL;
     printf("promote char/short assign VA %d %d\n", var3 = var1 + 1, var3 = var4 + 1);
     printf("promote char/short cast VA %d %d\n", (signed char)(var1 + 1), (signed char)(var4 + 1));
-#if !defined(__arm__)
+#if !defined __arm__ && !defined __riscv
     /* We can't really express GCC behaviour of return type promotion in
        the presence of undefined behaviour (like __csf is).  */
     var1 = csf(unsigned char,0x89898989);