Perl_sv_2iv_flags(), Perl_sv_2uv_flags, Perl_sv_2nv and

Perl_sv_2pv_flags() all return 0/0/0.0/"" without warning given a
NULL SV pointer so they ought to be marked as NULLOK in embed.fnc.

p4raw-id: //depot/perl@33285

Author: nwc10

embed.fnc

@@ -812,18 +812,18 @@ Apd	|IO*	|sv_2io		|NN SV* sv
 s	|bool	|glob_2number	|NN GV* const gv
 s	|char*	|glob_2pv	|NN GV* const gv|NULLOK STRLEN * const len
 #endif
-Amb	|IV	|sv_2iv		|NN SV* sv
-Apd	|IV	|sv_2iv_flags	|NN SV *const sv|const I32 flags
+Amb	|IV	|sv_2iv		|NULLOK SV *sv
+Apd	|IV	|sv_2iv_flags	|NULLOK SV *const sv|const I32 flags
 Apd	|SV*	|sv_2mortal	|NULLOK SV* sv
-Apd	|NV	|sv_2nv		|NN SV *const sv
+Apd	|NV	|sv_2nv		|NULLOK SV *const sv
 pMd	|SV*	|sv_2num	|NN SV *const sv
-Amb	|char*	|sv_2pv		|NN SV* sv|NULLOK STRLEN* lp
-Apd	|char*	|sv_2pv_flags	|NN SV *const sv|NULLOK STRLEN *const lp|const I32 flags
+Amb	|char*	|sv_2pv		|NULLOK SV *sv|NULLOK STRLEN *lp
+Apd	|char*	|sv_2pv_flags	|NULLOK SV *const sv|NULLOK STRLEN *const lp|const I32 flags
 Apd	|char*	|sv_2pvutf8	|NN SV* sv|NULLOK STRLEN* lp
 Apd	|char*	|sv_2pvbyte	|NN SV *const sv|NULLOK STRLEN *const lp
 Ap	|char*	|sv_pvn_nomg	|NN SV* sv|NULLOK STRLEN* lp
-Amb	|UV	|sv_2uv		|NN SV* sv
-Apd	|UV	|sv_2uv_flags	|NN SV *const sv|const I32 flags
+Amb	|UV	|sv_2uv		|NULLOK SV *sv
+Apd	|UV	|sv_2uv_flags	|NULLOK SV *const sv|const I32 flags
 Apd	|IV	|sv_iv		|NN SV* sv
 Apd	|UV	|sv_uv		|NN SV* sv
 Apd	|NV	|sv_nv		|NN SV* sv

proto.h

@@ -2169,25 +2169,15 @@ STATIC char*	S_glob_2pv(pTHX_ GV* const gv, STRLEN * const len)
 			__attribute__nonnull__(pTHX_1);
 
 #endif
-/* PERL_CALLCONV IV	Perl_sv_2iv(pTHX_ SV* sv)
-			__attribute__nonnull__(pTHX_1); */
-
-PERL_CALLCONV IV	Perl_sv_2iv_flags(pTHX_ SV *const sv, const I32 flags)
-			__attribute__nonnull__(pTHX_1);
-
+/* PERL_CALLCONV IV	Perl_sv_2iv(pTHX_ SV *sv); */
+PERL_CALLCONV IV	Perl_sv_2iv_flags(pTHX_ SV *const sv, const I32 flags);
 PERL_CALLCONV SV*	Perl_sv_2mortal(pTHX_ SV* sv);
-PERL_CALLCONV NV	Perl_sv_2nv(pTHX_ SV *const sv)
-			__attribute__nonnull__(pTHX_1);
-
+PERL_CALLCONV NV	Perl_sv_2nv(pTHX_ SV *const sv);
 PERL_CALLCONV SV*	Perl_sv_2num(pTHX_ SV *const sv)
 			__attribute__nonnull__(pTHX_1);
 
-/* PERL_CALLCONV char*	Perl_sv_2pv(pTHX_ SV* sv, STRLEN* lp)
-			__attribute__nonnull__(pTHX_1); */
-
-PERL_CALLCONV char*	Perl_sv_2pv_flags(pTHX_ SV *const sv, STRLEN *const lp, const I32 flags)
-			__attribute__nonnull__(pTHX_1);
-
+/* PERL_CALLCONV char*	Perl_sv_2pv(pTHX_ SV *sv, STRLEN *lp); */
+PERL_CALLCONV char*	Perl_sv_2pv_flags(pTHX_ SV *const sv, STRLEN *const lp, const I32 flags);
 PERL_CALLCONV char*	Perl_sv_2pvutf8(pTHX_ SV* sv, STRLEN* lp)
 			__attribute__nonnull__(pTHX_1);
 
@@ -2197,12 +2187,8 @@ PERL_CALLCONV char*	Perl_sv_2pvbyte(pTHX_ SV *const sv, STRLEN *const lp)
 PERL_CALLCONV char*	Perl_sv_pvn_nomg(pTHX_ SV* sv, STRLEN* lp)
 			__attribute__nonnull__(pTHX_1);
 
-/* PERL_CALLCONV UV	Perl_sv_2uv(pTHX_ SV* sv)
-			__attribute__nonnull__(pTHX_1); */
-
-PERL_CALLCONV UV	Perl_sv_2uv_flags(pTHX_ SV *const sv, const I32 flags)
-			__attribute__nonnull__(pTHX_1);
-
+/* PERL_CALLCONV UV	Perl_sv_2uv(pTHX_ SV *sv); */
+PERL_CALLCONV UV	Perl_sv_2uv_flags(pTHX_ SV *const sv, const I32 flags);
 PERL_CALLCONV IV	Perl_sv_iv(pTHX_ SV* sv)
 			__attribute__nonnull__(pTHX_1);