handle typedesc params in VM (#22581)

* handle typedesc params in VM

fixes #15760

* add test

* fix getType(typedesc) test

(cherry picked from commit 2e4e2f8f50)

tests/vm/ttypedesc.nim

@@ -0,0 +1,18 @@
+block: # issue #15760
+  type
+    Banana = object
+    SpecialBanana = object
+    
+  proc getName(_: type Banana): string = "Banana"
+  proc getName(_: type SpecialBanana): string = "SpecialBanana"
+
+  proc x[T](): string = 
+    const n = getName(T) # this one works
+    result = n
+    
+  proc y(T: type): string =
+    const n = getName(T) # this one failed to compile
+    result = n
+
+  doAssert x[SpecialBanana]() == "SpecialBanana"
+  doAssert y(SpecialBanana) == "SpecialBanana"

tests/vm/tvmmisc.nim

@@ -1,10 +1,11 @@
-# bug #4462
 import macros
 import os
 
+# bug #4462
 block:
   proc foo(t: typedesc) {.compileTime.} =
-    assert sameType(getType(t), getType(int))
+    assert sameType(getType(t), getType(typedesc[int]))
+    assert sameType(getType(t), getType(type int))
 
   static:
     foo(int)