Codegen fix for function pointers marked inline (#8866)

Fixes #5345
Fixes #5701

lib/nimbase.h

@@ -107,6 +107,8 @@ __clang__
 #  define N_INLINE(rettype, name) rettype __inline name
 #endif
 
+#define N_INLINE_PTR(rettype, name) rettype (*name)
+
 #if defined(__POCC__)
 #  define NIM_CONST /* PCC is really picky with const modifiers */
 #  undef _MSC_VER /* Yeah, right PCC defines _MSC_VER even if it is

tests/ccgbugs/t5345.nim

@@ -0,0 +1,10 @@
+discard """
+  output: true
+"""
+
+proc cmpx(d: int): bool {.inline.} = d > 0
+
+proc abc[C](cx: C, d: int) =
+  echo cx(d)
+  
+abc(cmpx, 10)

tests/ccgbugs/t5701.nim

@@ -0,0 +1,17 @@
+discard """
+  output: '''(Field0: 1, Field1: 1)
+(Field0: 2, Field1: 2)
+(Field0: 3, Field1: 3)
+'''
+"""
+
+iterator zip[T1, T2](a: openarray[T1], b: openarray[T2]): iterator() {.inline.} =
+  let len = min(a.len, b.len)
+  for i in 0..<len:
+    echo (a[i], b[i])
+
+proc foo(args: varargs[int]) =
+  for i in zip(args,args):
+    discard
+
+foo(1,2,3)