Pragma codegenDecl doesn't work inside iterators

[edubart]

I need to use __restrict__ C keyword inside an iterator, but when inside an iterator codegenDecl does not work, test case:

iterator myitems(s : seq[int]): int =
  var data {.codegenDecl: "$# __restrict__ $#".} :ptr int = nil
  yield 1

for i in @[1].myitems:
  discard

This generates the following C code:

		NI* data;
		nimln_(2, "test2.nim");
		data = NIM_NIL;

NI* data should have been NI* __restrict__ data

Any workarounds? I want to use restrict to make GCC optimize my iterator better.

[ringabout]

The issue is at transformVarSection in transf.nim.