[decompiler] fix missing casts issue (#573)

* fix casts issue

* fix bug

* one last small fix

test/decompiler/reference/engine/math/euler-h_REF.gc

@@ -39,5 +39,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-1 0))
+(let ((v0-2 0))
   )

test/decompiler/reference/engine/math/math_REF.gc

@@ -222,5 +222,5 @@
 ;; ERROR: function was not converted to expressions. Cannot decompile.
 
 ;; failed to figure out what this is:
-(let ((v0-6 0))
+(let ((v0-7 0))
   )

test/decompiler/reference/engine/math/quaternion-h_REF.gc

@@ -35,6 +35,5 @@
 (define *unity-quaternion* (new 'static 'quaternion :w 1.0))
 
 ;; failed to figure out what this is:
-(let ((v0-1 0))
+(let ((v0-2 0))
   )
-

test/decompiler/reference/engine/math/transform-h_REF.gc

@@ -45,6 +45,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-2 0))
+(let ((v0-4 0))
   )
-

test/decompiler/reference/engine/math/transformq-h_REF.gc

@@ -147,9 +147,5 @@
   )
 
 ;; failed to figure out what this is:
-(let ((v0-3 0))
+(let ((v0-8 0))
   )
-
-
-
-