Avoid newGVgen in blead-upstream modules

ExtUtils::ParseXS::Typemaps:
Just in documentation, but it’s good to change it, in case peo-
ple copy it.

Time::HiRes:
It doesn’t even use these typemap entries, but I changed it in case
they get used in the future.  (The changes are not identical to the
default typemap, because Time::HiRes is 5.6-compatible, at least
nominally.)

os2/os2.c:
No, this is not a module, but I changed it, too.

Some other instances of newGVgen are already handled properly, or are
just in tests, so I left them alone.

dist/ExtUtils-ParseXS/lib/ExtUtils/Typemaps.pm

@@ -781,7 +781,9 @@ corresponding OUTPUT code:
                 $var.context.value().size());
   ',
     'T_OUT' => '    {
-            GV *gv = newGVgen("$Package");
+            GV *gv = (GV *)sv_newmortal();
+            gv_init_pvn(gv, gv_stashpvs("$Package",1),
+                       "__ANONIO__",10,0);
             if ( do_open(gv, "+>&", 3, FALSE, 0, 0, $var) )
                 sv_setsv(
                   $arg,

dist/Time-HiRes/typemap

@@ -282,7 +282,8 @@ T_ARRAY
         }
 T_STDIO
 	{
-	    GV *gv = newGVgen("$Package");
+	    GV *gv = (GV *)sv_newmortal();
+	    gv_init(gv, gv_stashpv("$Package",1),"__ANONIO__",10,0);
 	    PerlIO *fp = PerlIO_importFILE($var,0);
 	    if ( fp && do_open(gv, "+<&", 3, FALSE, 0, 0, fp) )
 		sv_setsv($arg, sv_bless(newRV((SV*)gv), gv_stashpv("$Package",1)));
@@ -291,23 +292,26 @@ T_STDIO
 	}
 T_IN
 	{
-	    GV *gv = newGVgen("$Package");
+	    GV *gv = (GV *)sv_newmortal();
+	    gv_init(gv, gv_stashpv("$Package",1),"__ANONIO__",10,0);
 	    if ( do_open(gv, "<&", 2, FALSE, 0, 0, $var) )
 		sv_setsv($arg, sv_bless(newRV((SV*)gv), gv_stashpv("$Package",1)));
 	    else
 		$arg = &PL_sv_undef;
 	}
 T_INOUT
 	{
-	    GV *gv = newGVgen("$Package");
+	    GV *gv = (GV *)sv_newmortal();
+	    gv_init(gv, gv_stashpv("$Package",1),"__ANONIO__",10,0);
 	    if ( do_open(gv, "+<&", 3, FALSE, 0, 0, $var) )
 		sv_setsv($arg, sv_bless(newRV((SV*)gv), gv_stashpv("$Package",1)));
 	    else
 		$arg = &PL_sv_undef;
 	}
 T_OUT
 	{
-	    GV *gv = newGVgen("$Package");
+	    GV *gv = (GV *)sv_newmortal();
+	    gv_init(gv, gv_stashpv("$Package",1),"__ANONIO__",10,0);
 	    if ( do_open(gv, "+>&", 3, FALSE, 0, 0, $var) )
 		sv_setsv($arg, sv_bless(newRV((SV*)gv), gv_stashpv("$Package",1)));
 	    else

os2/os2.c

@@ -4257,7 +4257,8 @@ XS(XS_OS2_pipe)
 	perlio = PerlIO_fdopen(hpipe, buf);
 	ST(0) = sv_newmortal();
 	{
-	    GV *gv = newGVgen("OS2::pipe");
+	    GV *gv = (GV *)sv_newmortal();
+	    gv_init_pvn(gv, gv_stashpvs("OS2::pipe",1),"__ANONIO__",10,0);
 	    if ( do_open6(gv, perltype, strlen(perltype), perlio, NULL, 0) )
 		sv_setsv(ST(0), sv_bless(newRV((SV*)gv), gv_stashpv("IO::Handle",1)));
 	    else