[decompiler] fix missing casts issue (#573)

* fix casts issue

* fix bug

* one last small fix

test/decompiler/reference/engine/load/load-dgo_REF.gc

@@ -288,7 +288,7 @@
       )
      )
     )
-   (the-as pointer (the-as uint load-location))
+   (the-as pointer load-location)
    )
   )
 
@@ -417,7 +417,3 @@
    )
   (none)
   )
-
-
-
-

test/decompiler/reference/engine/load/loader-h_REF.gc

@@ -272,9 +272,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-5 0))
+(let ((v0-12 0))
   )
-
-
-
-

test/decompiler/reference/engine/load/ramdisk_REF.gc

@@ -101,9 +101,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-4 0))
+(let ((v0-7 0))
   )
-
-
-
-