Fix some code suppression fallout

Some more subtle issues with code suppression:
- outputting asms but not their operand setup is broken
- but global asms must always be output
- statement expressions are transparent to code suppression
- vtop can't be transformed from VT_CMP/VT_JMP when nocode_wanted

Also remove .exe files from tests2 if they don't fail.

tests/tests2/Makefile

@@ -59,7 +59,7 @@ all test: $(filter-out $(SKIP),$(TESTS))
 	    $(TCC) $< -o ./$*.exe $(FILTER) 2>&1 && \
 	    ./$*.exe $(ARGS) >$*.output 2>&1 || true; \
 	  fi
-	@diff -Nbu $(SRC)/$*.expect $*.output && rm -f $*.output
+	@diff -Nbu $(SRC)/$*.expect $*.output && rm -f $*.output $*.exe
 
 # automatically generate .expect files with gcc:
 %.expect : %.c