basic : use more OUString literals in basic comp

Change-Id: Ib67bee7e4ba85602be266bb7acc23c52251548b4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177611
Tested-by: Jenkins
Reviewed-by: Arnaud Versini <arnaud.versini@pm.me>

basic/source/comp/buffer.cxx

@@ -82,7 +82,7 @@ void SbiBuffer::Chain( sal_uInt32 off )
         if ((i + sizeof(sal_uInt32)) > GetSize())
         {
             m_aErrCode = ERRCODE_BASIC_INTERNAL_ERROR;
-            m_sErrMsg = "BACKCHAIN";
+            m_sErrMsg = u"BACKCHAIN"_ustr;
             break;
         }
         auto ip = m_aBuf.begin() + i;

basic/source/comp/token.cxx

@@ -274,13 +274,13 @@ const OUString& SbiTokenizer::Symbol( SbiToken t )
     switch( t )
     {
     case NEG   :
-        aSym = "-";
+        aSym = u"-"_ustr;
         return aSym;
     case EOS   :
-        aSym = ":/CRLF";
+        aSym = u":/CRLF"_ustr;
         return aSym;
     case EOLN  :
-        aSym = "CRLF";
+        aSym = u"CRLF"_ustr;
         return aSym;
     default:
         break;
@@ -296,7 +296,7 @@ const OUString& SbiTokenizer::Symbol( SbiToken t )
     const sal_Unicode *p = aSym.getStr();
     if (*p <= ' ')
     {
-        aSym = "???";
+        aSym = u"???"_ustr;
     }
     return aSym;
 }