Cross-module refusal of method call syntax for type conversion in generic

[awr1]

# importme.nim
type Foo = int32
proc baz*[T](y :int) =
  echo y.Foo

# main.nim
import importme
baz[float](1'i8)

baz[float](1'i8) can be called in importme just fine, but not in main, giving the error:

Error: undeclared field: 'Foo' for type system.int [declared in c:\dev\fork\Nim\lib\system\basic_types.nim(2, 3)] 

Using the normal call syntax allows the code to compile fine, however:

proc baz*[T](y :int) =
  echo Foo(y)

[awr1]

This issue is also generic-specific, removing the generic param permits compilation.

[timotheecour]

pretty related: #14819