Add valid_utf8_to_uv()

This is identical to valid_utf8_to_uvchr().  They are both internal
functions designed for when you are certain that the utf8 string to be
translated is well formed; generally you created it yourself earlier.

The only reason for this new synonym is to lessen the cognitive load on
programmers who should be using the "_uv" suffix functions, and not the
"_uvchr" suffix ones for these sorts of tasks.  By having this synonym,
one doesn't have to learn that there are two.

Author: khwilliamson

embed.fnc

@@ -3895,7 +3895,10 @@ Adp	|bool	|valid_identifier_pvn					\
 				|U32 flags
 Adp	|bool	|valid_identifier_sv					\
 				|NULLOK SV *sv
-CRTdip	|UV	|valid_utf8_to_uvchr					\
+CRTdip	|UV	|valid_utf8_to_uv					\
+				|NN const U8 *s 			\
+				|NULLOK STRLEN *retlen
+CRTdmp	|UV	|valid_utf8_to_uvchr					\
 				|NN const U8 *s 			\
 				|NULLOK STRLEN *retlen
 Adp	|int	|vcmp		|NN SV *lhv				\

embed.h

@@ -841,7 +841,8 @@
 # define valid_identifier_pve(a,b,c)            Perl_valid_identifier_pve(aTHX_ a,b,c)
 # define valid_identifier_pvn(a,b,c)            Perl_valid_identifier_pvn(aTHX_ a,b,c)
 # define valid_identifier_sv(a)                 Perl_valid_identifier_sv(aTHX_ a)
-# define valid_utf8_to_uvchr                    Perl_valid_utf8_to_uvchr
+# define valid_utf8_to_uv                       Perl_valid_utf8_to_uv
+# define Perl_valid_utf8_to_uvchr               valid_utf8_to_uvchr
 # define vcmp(a,b)                              Perl_vcmp(aTHX_ a,b)
 # define vcroak(a,b)                            Perl_vcroak(aTHX_ a,b)
 # define vdeb(a,b)                              Perl_vdeb(aTHX_ a,b)

inline.h

@@ -1306,25 +1306,36 @@ Perl_utf8_to_bytes_overwrite(pTHX_ U8 **s_ptr, STRLEN *lenp)
 }
 
 /*
-=for apidoc valid_utf8_to_uvchr
-Like C<L<perlapi/utf8_to_uv>>, but should only be called when it is
+=for apidoc      valid_utf8_to_uv
+=for apidoc_item valid_utf8_to_uvchr
+
+These are synonymous.
+
+These are like C<L<perlapi/utf8_to_uv>>, but should only be called when it is
 known that the next character in the input UTF-8 string C<s> is well-formed
 (I<e.g.>, it passes C<L<perlapi/isUTF8_CHAR>>.  Surrogates, non-character code
 points, and non-Unicode code points are allowed.
 
+The only use for these is that they should run slightly faster than
+C<utf8_to_uv> because no error checking is done.
+
+The C<_uv> form is slightly preferred so as to have a consistent spelling with
+the other C<_uv> forms that are definitely preferred over the older and
+problematic C<_uvchr> forms.
+
 =cut
 
  */
 
 PERL_STATIC_INLINE UV
-Perl_valid_utf8_to_uvchr(const U8 *s, STRLEN *retlen)
+Perl_valid_utf8_to_uv(const U8 *s, STRLEN *retlen)
 {
+    PERL_ARGS_ASSERT_VALID_UTF8_TO_UV;
+
     const UV expectlen = UTF8SKIP(s);
     const U8* send = s + expectlen;
     UV uv = *s;
 
-    PERL_ARGS_ASSERT_VALID_UTF8_TO_UVCHR;
-
     if (retlen) {
         *retlen = expectlen;
     }

pod/perldelta.pod

@@ -434,6 +434,13 @@ memory saving is unrealistic.
 C<sv_vcatpvfn_flags()> now substitutes the Unicode REPLACEMENT CHARACTER
 for malformed input.  Previously it used the NUL character.
 
+=item *
+
+A new function C<valid_utf8_to_uv> has been added.  This is synonymous
+with C<valid_utf8_to_uvchr>; its reason for existence is to parallel the
+names of the other functions that translate from UTF-8, so you don't
+have to remember a different spelling.
+
 =back
 
 =head1 Selected Bug Fixes

proto.h

@@ -191,6 +191,7 @@ For details, see the description for L<perlapi/uv_to_utf8_flags>.
 #define c9strict_utf8_to_uv(s, e, cp_p, advance_p)                      \
         utf8_to_uv_flags(   s, e, cp_p, advance_p,                      \
                                  UTF8_DISALLOW_ILLEGAL_C9_INTERCHANGE)
+#define valid_utf8_to_uvchr(s, advance_p)  valid_utf8_to_uv(s, advance_p)
 
 #define utf16_to_utf8(p, d, bytelen, newlen)                                \
                             utf16_to_utf8_base(p, d, bytelen, newlen, 0, 1)