Don't re-create the interpreter context for each row.

Change-Id: I272c9dc09806d47add26866f517e6ea07282c35f
Reviewed-on: https://gerrit.libreoffice.org/45087Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

sc/source/core/tool/formulagroup.cxx

@@ -175,6 +175,9 @@ public:
         double fNan;
         rtl::math::setNan(&fNan);
         ScTokenArray aCode2;
+
+        ScInterpreterContext aContext(mrDoc, mpFormatter);
+
         for (SCROW i = mnIdx; i <= mnLastIdx; ++i, maBatchTopPos.IncRow())
         {
             formula::FormulaTokenArrayPlainIterator aIter(mrCode);
@@ -298,7 +301,6 @@ public:
 
             ScCompiler aComp(&mrDoc, maBatchTopPos, aCode2);
             aComp.CompileTokenArray();
-            ScInterpreterContext aContext(mrDoc, mpFormatter);
             ScInterpreter aInterpreter(pDest, &mrDoc, aContext, maBatchTopPos, aCode2);
             aInterpreter.Interpret();
             mrResults[i] = aInterpreter.GetResultToken();