[ruby/prism] Fix a bug where we removed the \r warning

ruby/prism@559f24fae0

Author: kddnewton

prism/prism.c

@@ -9908,12 +9908,17 @@ parser_lex(pm_parser_t *parser) {
             // stores back to parser->current.end.
             bool chomping = true;
             while (parser->current.end < parser->end && chomping) {
-                if (pm_char_is_inline_whitespace(*parser->current.end)) {
-                    const uint8_t *scan = parser->current.end + 1;
-                    while (scan < parser->end && pm_char_is_inline_whitespace(*scan)) scan++;
-                    parser->current.end = scan;
-                    space_seen = true;
-                    continue;
+                {
+                    static const uint8_t inline_whitespace[256] = {
+                        [' '] = 1, ['\t'] = 1, ['\f'] = 1, ['\v'] = 1
+                    };
+                    const uint8_t *scan = parser->current.end;
+                    while (scan < parser->end && inline_whitespace[*scan]) scan++;
+                    if (scan > parser->current.end) {
+                        parser->current.end = scan;
+                        space_seen = true;
+                        continue;
+                    }
                 }
 
                 switch (*parser->current.end) {