another change towards a shareable optree: avoid pointer to filegv

in COP; revert parts of change#4485 and s/xcv_filegv/xcv_file/
(CvFILE() may yet come in handy somewhere); adjust compiler doodads
to suit

p4raw-link: @4485 on //depot/perl: b195d4879f55e1610299cb9b1b55356940c2a577

p4raw-id: //depot/perl@4545

1 files changed, 1 insertions, 1 deletions

diff --git a/pp.c b/pp.c
index 7d1673cb70..c04d7b2be2 100644
--- a/pp.c
+++ b/pp.c
@@ -854,7 +854,7 @@ PP(pp_undef)
 	    Newz(602, gp, 1, GP);
 	    GvGP(sv) = gp_ref(gp);
 	    GvSV(sv) = NEWSV(72,0);
-	    GvLINE(sv) = PL_curcop->cop_line;
+	    GvLINE(sv) = CopLINE(PL_curcop);
 	    GvEGV(sv) = (GV*)sv;
 	    GvMULTI_on(sv);
 	}