fixes #1202; if expression containing procedure calls doesn't compile (#1208)

fixes #1202

Author: ringabout

src/nimony/controlflow.nim

@@ -299,10 +299,13 @@ proc trUseExpr(c: var ControlFlow; n: var Cursor) =
 
 proc trStmtOrExpr(c: var ControlFlow; n: var Cursor; tar: var Target) =
   if tar.m != IsIgnored:
+    var aa = Target(m: IsEmpty)
+    # it may be a `ExprX` so we generate statements before `AsgnS`
+    trExpr c, n, aa
     c.dest.addParLe(AsgnS, n.info)
     assert tar.t.len > 0
     c.dest.add tar
-    trUseExpr c, n
+    c.dest.add aa
     c.dest.addParRi()
   else:
     trStmt c, n

tests/nimony/sysbasics/tconditionals.nim

@@ -0,0 +1,7 @@
+proc foo = discard
+
+var x = if true:
+    1
+  else:
+    foo()
+    2