arm64: fix symbol addends on LLP64 hosts

The host-sized symbol addend parameter was introduced by commit b14ef0e2 and truncates 64-bit addends on LLP64 hosts.

Use addr_t and cover the negative-addend case.

arm64-gen.c

@@ -463,7 +463,7 @@ static void arm64_strv(int sz_, int dst, int bas, uint64_t off)
     }
 }
 
-static void arm64_sym(int r, Sym *sym, unsigned long addend)
+static void arm64_sym(int r, Sym *sym, addr_t addend)
 {
     if (sym->type.t & VT_TLS) {
 #if TCC_TARGET_PE

tests/tests2/152_arm64_addend.c

@@ -0,0 +1,17 @@
+#include <stdint.h>
+#include <stdio.h>
+
+static unsigned short data[844];
+
+static uint64_t address_for_index(int index)
+{
+    return (uint64_t)(uintptr_t)data - 845186ULL
+           + (uint64_t)index * 2;
+}
+
+int main(void)
+{
+    printf("%d\n", address_for_index(422593)
+                    == (uint64_t)(uintptr_t)data);
+    return 0;
+}

tests/tests2/152_arm64_addend.expect

@@ -0,0 +1 @@
+1