rb_strlen_lit: support wide string literals

Merged: https://github.com/ruby/ruby/pull/12046

include/ruby/internal/intern/string.h

@@ -1689,7 +1689,7 @@ rbimpl_exc_new_cstr(VALUE exc, const char *str)
  * @return     An integer  constant expression that represents  `str`'s length,
  *             in bytes, not including the terminating NUL character.
  */
-#define rb_strlen_lit(str) (sizeof(str "") - 1)
+#define rb_strlen_lit(str) ((sizeof(str "") / sizeof(str ""[0])) - 1)
 
 /**
  * Identical to rb_str_new_static(), except it cannot take string variables.

universal_parser.c

@@ -23,7 +23,7 @@
 # define FALSE   0
 #endif
 #define numberof(array) ((int)(sizeof(array) / sizeof((array)[0])))
-#define rb_strlen_lit(str) (sizeof(str "") - 1)
+#define rb_strlen_lit(str) ((sizeof(str "") / sizeof(str ""[0])) - 1)
 #undef FIXNUM_MAX
 #define FIXNUM_MAX (LONG_MAX / 2)