Use 0-padding for i386 and arm print format specifiers

[fjricci]

Summary

This is used for the other architectures in print_address, but is
missing from i386 and arm.

[m.ostapenko]

lgtm

compiler-rt/trunk/test/sanitizer_common/print_address.h

 #include <stdio.h>
 #include <stdarg.h>
 
 void print_address(const char *str, int n, ...) {
   fprintf(stderr, "%s", str);
   va_list ap;
   va_start(ap, n);
   while (n--) {
     void *p = va_arg(ap, void *);
 #if defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__)
     // On FreeBSD, the %p conversion specifier works as 0x%x and thus does not
     // match to the format used in the diagnotic message.
     fprintf(stderr, "0x%012lx ", (unsigned long) p);
 #elif defined(__i386__) || defined(__arm__)
-    fprintf(stderr, "0x%8lx ", (unsigned long) p);
+    fprintf(stderr, "0x%08lx ", (unsigned long) p);
 #elif defined(__mips64)
     fprintf(stderr, "0x%010lx ", (unsigned long) p);
 #endif
   }
   fprintf(stderr, "\n");
 }