x86-asm: Correctly infer register size for bools

Register operands of type _Bool weren't correctly getting
the 8-bit sized registers (but rather used the default 32-bit
ones).

tests/tcctest.c

@@ -2678,6 +2678,9 @@ void asm_test(void)
     /* Hide the outer base_func, but check later that the inline
        asm block gets the outer one.  */
     int base_func = 42;
+    void override_func3 (void);
+    unsigned long asmret;
+#ifdef BOOL_ISOC99
     _Bool somebool;
 #endif
 
@@ -2726,6 +2729,13 @@ void asm_test(void)
     /* Check that we can also load structs of appropriate layout
        into registers.  */
     asm volatile("" : "=r" (asmret) : "0"(s2));
+    if (asmret != s2.addr)
+      printf("asmstr: failed\n");
+#ifdef BOOL_ISOC99
+    /* Check that the typesize correctly sets the register size to
+       8 bit.  */
+    asm volatile("cmp %1,%2; sete %0" : "=a"(somebool) : "r"(1), "r"(2));
+    if (!somebool)
       printf("asmbool: failed\n");
 #endif
     return;