Add uv_to_utf8 macro family

These are the inverse of the utf8_to_uv family in GH #22541.  They are
just macros that are synonyms to existing functions, and are being added
to reduce cognitive load, so if you know one name, you automatically can
figure out the inverse.

Author: khwilliamson

embed.fnc

@@ -3809,6 +3809,17 @@ Cp	|U8 *	|uvoffuni_to_utf8_flags_msgs				\
 				|UV input_uv				\
 				|const UV flags 			\
 				|NULLOK HV **msgs
+
+Admp	|U8 *	|uv_to_utf8	|NN U8 *d				\
+				|UV uv
+Admp	|U8 *	|uv_to_utf8_flags					\
+				|NN U8 *d				\
+				|UV uv					\
+				|UV flags
+Admp	|U8 *	|uv_to_utf8_msgs|NN U8 *d				\
+				|UV uv					\
+				|UV flags				\
+				|NULLOK HV **msgs
 CDbp	|U8 *	|uvuni_to_utf8	|NN U8 *d				\
 				|UV uv
 EXdpx	|bool	|validate_proto |NN SV *name				\

embed.h

@@ -873,6 +873,9 @@
 # define utf8n_to_uvchr                         Perl_utf8n_to_uvchr
 # define utf8n_to_uvchr_error                   Perl_utf8n_to_uvchr_error
 # define utf8n_to_uvchr_msgs                    Perl_utf8n_to_uvchr_msgs
+# define uv_to_utf8(a,b)                        Perl_uv_to_utf8(aTHX,a,b)
+# define uv_to_utf8_flags(a,b,c)                Perl_uv_to_utf8_flags(aTHX,a,b,c)
+# define uv_to_utf8_msgs(a,b,c,d)               Perl_uv_to_utf8_msgs(aTHX,a,b,c,d)
 # define uvchr_to_utf8(a,b)                     Perl_uvchr_to_utf8(aTHX,a,b)
 # define uvchr_to_utf8_flags(a,b,c)             Perl_uvchr_to_utf8_flags(aTHX,a,b,c)
 # define uvchr_to_utf8_flags_msgs(a,b,c,d)      Perl_uvchr_to_utf8_flags_msgs(aTHX,a,b,c,d)

proto.h

@@ -142,11 +142,11 @@ typedef enum {
 #define uvoffuni_to_utf8_flags(d,uv,flags)                                     \
                                uvoffuni_to_utf8_flags_msgs(d, uv, flags, 0)
 
-#define Perl_uvchr_to_utf8(mTHX, d, u)                                          \
-        Perl_uvchr_to_utf8_flags(aTHX, d, u, 0)
-#define Perl_uvchr_to_utf8_flags(mTHX, d, u, f)                                 \
-        Perl_uvchr_to_utf8_flags_msgs(aTHX, d, u, f, 0)
-#define Perl_uvchr_to_utf8_flags_msgs(mTHX, d, u, f , m)                        \
+#define Perl_uv_to_utf8(mTHX, d, u)                                         \
+        Perl_uv_to_utf8_flags(aTHX, d, u, 0)
+#define Perl_uv_to_utf8_flags(mTHX, d, u, f)                                \
+        Perl_uv_to_utf8_msgs(aTHX, d, u, f, 0)
+#define Perl_uv_to_utf8_msgs(mTHX, d, u, f , m)                             \
         Perl_uvoffuni_to_utf8_flags_msgs(aTHX_ d, NATIVE_TO_UNI(u), f, m)
 
 /* This is needed to cast the parameters for all those calls that had them
@@ -173,6 +173,9 @@ typedef enum {
 #define Perl_c9strict_utf8_to_uv(s, e, cp_p, advance_p)                     \
         Perl_utf8_to_uv_flags(   s, e, cp_p, advance_p,                     \
                                      UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE)
+#define Perl_uvchr_to_utf8              Perl_uv_to_utf8
+#define Perl_uvchr_to_utf8_flags        Perl_uv_to_utf8_flags
+#define Perl_uvchr_to_utf8_flags_msgs   Perl_uv_to_utf8_msgs
 
 #define utf16_to_utf8(p, d, bytelen, newlen)                                \
                             utf16_to_utf8_base(p, d, bytelen, newlen, 0, 1)