Fix AArch64

Author: CraftSpider

src/backtrace/dbghelp64.rs

@@ -67,12 +67,12 @@ impl MyContext {
 #[cfg(target_arch = "aarch64")]
 impl MyContext {
     #[inline(always)]
-    fn ip(&self) -> DWORD64 {
+    fn ip(&self) -> u64 {
         self.0.Pc
     }
 
     #[inline(always)]
-    fn sp(&self) -> DWORD64 {
+    fn sp(&self) -> u64 {
         self.0.Sp
     }
 }