fixes #24378; supportsCopyMem can fail from macro context with tuples (#24383)

fixes #24378

```nim
type Win = typeof(`body`)
doAssert not supportsCopyMem((int, Win))
```

`semAfterMacroCall` doesn't skip the children aliases types in the tuple
typedesc construction while the normal program seem to skip the aliases
types somewhere

`(int, Win)` is kept as `(int, alias string)` instead of expected `(int,
string)`

tests/metatype/ttypetraits.nim

@@ -1,3 +1,7 @@
+discard """
+  joinable: false
+"""
+
 import typetraits
 import macros
 
@@ -402,3 +406,26 @@ when true: # Odd bug where alias can seep inside of `distinctBase`
   proc `$`*[T: AdtChild](adtChild: T): string = ""
 
   check 10 is int
+
+
+block: # bug #24378
+  macro forked(body: typed): untyped = # typed or untyped does not matter
+    result = quote do:
+      type Win = typeof(`body`)
+      doAssert not supportsCopyMem((int, Win))
+      doAssert not supportsCopyMem(tuple[a: int, b: Win])
+
+      type Win2[T] = typeof(`body`)
+      doAssert not supportsCopyMem((int, Win2[int]))
+      doAssert not supportsCopyMem(tuple[a: int, b: Win2[int]])
+  forked:
+    "foobar"
+
+
+  type Win111 = typeof("foobar")
+  doAssert not supportsCopyMem((int, Win111))
+  doAssert not supportsCopyMem(tuple[a: int, b: Win111])
+
+  type Win222[T] = typeof("foobar")
+  doAssert not supportsCopyMem((int, Win222[int]))
+  doAssert not supportsCopyMem(tuple[a: int, b: Win222[int]])