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/tests2/85-asm-outside-function.c

@@ -1,7 +1,9 @@
+extern int printf (const char *, ...);
 extern void vide(void);
 __asm__("vide: ret");
 
 int main() {
     vide();
+    printf ("okay\n");
     return 0;
 }

tests/tests2/85-asm-outside-function.expect

@@ -0,0 +1 @@
+okay

tests/tests2/88_codeopt.c

@@ -0,0 +1,68 @@
+/* Check some way in where code suppression caused various
+   miscompilations.  */
+extern int printf (const char *, ...);
+typedef unsigned long size_t;
+
+size_t _brk_start, _brk_end;
+void * extend_brk(size_t size, size_t align)
+{
+    size_t mask = align - 1;
+    void *ret = 0;
+
+     do {
+	 if (__builtin_expect(!!(_brk_start == 0), 0))
+	   do {
+	       printf("wrong1\n");
+	   } while (0);
+     } while (0);
+     _brk_end = (_brk_end + mask) & ~mask;
+     ret = (void *)_brk_end;
+     _brk_end += size;
+
+     return ret;
+}
+
+static void get_args (int a, int b)
+{
+  if (a != 1)
+    printf("wrong2\n");
+  else
+    printf("okay\n");
+}
+
+void bla(void)
+{
+  int __ret = 42;
+  ({
+    if (__builtin_expect(!!(0), 0)) {
+      if (__builtin_expect(!!__ret, 0))
+        printf("wrong3\n");
+      int x = !!(__ret);
+    }
+    __ret;
+  });
+  get_args(!!__ret, sizeof(__ret));
+}
+
+_Bool chk(unsigned long addr, unsigned long limit, unsigned long size)
+{
+  _Bool ret;
+  /* This just needs to compile, no runtime test.  (And it doesn't compile
+     only with certain internal checking added that's not committed).  */
+  if (0)
+    ret = 0 != (!!(addr > limit - size));
+}
+
+int main()
+{
+  void *r;
+  _brk_start = 1024;
+  _brk_end = 1024;
+  r = extend_brk (4096, 16);
+  if (!r)
+    printf("wrong4\n");
+  else
+    printf("okay\n");
+  bla();
+  return 0;
+}

tests/tests2/88_codeopt.expect

@@ -0,0 +1,2 @@
+okay
+okay

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