Add pnacl-gcc generated code back into the callingconv test mix

tests/callingconv/callingconv.c

 /*
  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #undef NDEBUG
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <assert.h>
 #include <stdarg.h>
 #include <string.h>
 #include <callingconv.h>
 
 /* Keep track of current function, call, and satisfied asserts */
 int current_module = -1;
 int current_call = -1;
 int current_function = -1;
 int *current_index_p = NULL;
 int assert_count = 0;
 
 const char *script_argv;
-void module0(void);
-void module1(void);
-void module2(void);
-void module3(void);
+void module0(void) __attribute__((weak));
+void module1(void) __attribute__((weak));
+void module2(void) __attribute__((weak));
+void module3(void) __attribute__((weak));
+void module4(void) __attribute__((weak));
+void module5(void) __attribute__((weak));
 
 int main(int argc, const char *argv[]) {
-  module0();
-  module1();
-  module2();
-  module3();
+  if (module0) module0();
+  if (module1) module1();
+  if (module2) module2();
+  if (module3) module3();
+  if (module4) module4();
+  if (module5) module5();
 
   printf("generate.py arguments: %s\n", script_argv);
   printf("SUCCESS: %d calls OK.\n", assert_count);
   return 0;
 }
 
 
 /* Helper for setting values in tiny_t struct */
 void set_tiny_t(tiny_t *ptr, char a, short b) {
   ptr->a = a;
@@ skipping 37 matching lines @@
 
 int tiny_cmp(const tiny_t x, const tiny_t y) {
   return EQ(a) && EQ(b);
 }
 
 int big_cmp(const big_t x, const big_t y) {
   return EQ(a) && EQ(b) && EQ(c) && EQ(d) &&
          EQ(e) && EQ(f) && EQ(g) && EQ(h) &&
          EQ(i) && EQ(j) && EQ(k) && EQ(l) && EQ(m);
 }