closes #19585; adds a test case for #21648 (#24310)

closes #19585
follow up #21648

(cherry picked from commit 922f7dfd71)

tests/ccgbugs/t19585.nim

@@ -0,0 +1,13 @@
+discard """
+  targets: "c cpp"
+"""
+
+# bug #19585
+
+type
+  X* {.exportc.} = object
+    v: int
+
+{.emit:"""
+X x = { 1234 };
+""".}