Inlined newSV_type(SVt_NULL) leaner than non-inlined newSV(0)

When a function outside of sv.c creates a SV via newSV(0):
 * There is a call to Perl_newSV
 * A SV head is uprooted and its flags set
 * A runtime check is made to effectively see if 0 > 0
 * The new SV* is returned

Replacing newSV(0) with newSV_type(SVt_NULL) should be more efficient,
because (assuming there are SV heads to uproot), the only step is:
 * A SV head is uprooted and its flags set

1 files changed, 1 insertions, 1 deletions

diff --git a/dump.c b/dump.c
index be53642147..e19f604bae 100644
--- a/dump.c
+++ b/dump.c
@@ -2693,7 +2693,7 @@ S_append_gv_name(pTHX_ GV *gv, SV *out)
         sv_catpvs_nomg(out, "<NULLGV>");
         return;
     }
-    sv = newSV(0);
+    sv = newSV_type(SVt_NULL);
     gv_fullname4(sv, gv, NULL, FALSE);
     Perl_sv_catpvf(aTHX_ out, "$%" SVf, SVfARG(sv));
     SvREFCNT_dec_NN(sv);