tests,cachetest,loader: fix pc-relative addressing for global array

* The original code is not PIC, since it accesses a gloabl array. If we
  copy the code to somewhere else, it cannot access that global array
  any longer. To fix this, we pass the global array as function argument
  to make the code PIC.
* Now NOOP can pass the loader test with fence.i.

tests/cachetest/tests/loader.c

@@ -2,7 +2,7 @@
 
 int a[10] = {};
 
-int f1(int n) {
+int f1(int n, int *a) {
   int sum = 0;
   for (int i = 0; i < n; i ++) {
     sum += a[i];
@@ -10,7 +10,7 @@ int f1(int n) {
   return sum;
 }
 
-int f2(int n) {
+int f2(int n, int *a) {
   int sum = 1;
   for (int i = 0; i < n; i ++) {
     sum *= a[i];
@@ -24,13 +24,13 @@ int test(void *f) {
   printf("copy code...\n");
   memcpy(code, f, sizeof(code));
 
-  int (*p)(int) = (void *)code;
 #ifdef __ISA_RISCV64__
   asm volatile("fence.i");
 #endif
 
+  int (*p)(int, int*) = (void *)code;
   printf("jump to  code...\n");
-  int ret = p(10);
+  int ret = p(10, a);
   printf("ret = %d\n", ret);
   return ret;
 }