MXS-1536: Fix crash in CREATE TABLE

If a CREATE TABLE statement had a quoted keyword as the name of a field,
the calculated column count and actual column counts would differ.

In addition to this, oneline comments before the end of the statement
would truncate the SQL due to the fact that the whitespace was squashed
before the comment removal was done.

server/core/utils.c

@@ -553,7 +553,9 @@ strip_escape_chars(char* val)
 #define BUFFER_GROWTH_RATE 2.0
 static pcre2_code* remove_comments_re = NULL;
 static const PCRE2_SPTR remove_comments_pattern = (PCRE2_SPTR)
-                                                  "(?:`[^`]*`\\K)|(\\/[*](?!(M?!)).*?[*]\\/)|(?:#.*|--[[:space:]].*)";
+                                                  "(?:`[^`]*`\\K)|"
+                                                  "(\\/[*](?!(M?!)).*?[*]\\/)|"
+                                                  "([[:space:]](?:#.*|--[[:space:]].*(\\n|\\r\\n)))";
 
 /**
  * Remove SQL comments from the end of a string