A partial reverse for commit eda2c756ed

Author: Thomas Preud'homme <robotux@celest.fr>
	Date:   Tue Dec 31 23:51:20 2013 +0800

	Move logic for if (int value) to tccgen.c
	Move the logic to do a test of an integer value (ex if (0)) out of
	arch-specific code to tccgen.c to avoid code duplication. This also
        fixes test of long long value which was only testing the bottom half of
	such values on 32 bits architectures.

I don't understand why if () in gtst(i) was removed.
This patch allows to compile a linux kernel v.2.4.26
W/o this patch a tcc simply crashes.

i386-gen.c

@@ -677,7 +677,7 @@ ST_FUNC int gtst(int inv, int t)
         /* fast case : can jump directly since flags are set */
         g(0x0f);
         t = psym((vtop->c.i - 16) ^ inv, t);
-    } else { /* VT_JMP || VT_JMPI */
+    } else if (v == VT_JMP || v == VT_JMPI) {
         /* && or || optimization */
         if ((v & 1) == inv) {
             /* insert vtop->c jump list in t */