Use defining symrefs from defining map for <eaEscapeHelper> call

TR_EscapeAnalysisTools::processSymbolReferences uses a BitVector to
accumulate the symbol reference numbers for symbols that are to be
loaded on an <eaEscapeHelper> call.  In walking through the set of
defining symbols associated with a particular local symbol, the code was
adding the reference number for the original symbol to the BitVector of
symbols to be loaded for the <eaEscapeHelper> call rather than the
reference numbers for the associated defining symbols.  That can lead
Escape Analysis to miss potential escapes of references through induce
OSR blocks or peeked calls.

runtime/compiler/optimizer/EscapeAnalysisTools.cpp

@@ -202,7 +202,7 @@ void TR_EscapeAnalysisTools::processSymbolReferences(TR_Array<List<TR::SymbolRef
                   if ((definingSym->isAuto() || definingSym->isParm())
                       && (deadSymRefs == NULL || !deadSymRefs->isSet(definingSymRefNum)))
                      {
-                     symRefsToLoad.set(symRefNum);
+                     symRefsToLoad.set(definingSymRefNum);
 
                      if (_comp->trace(OMR::escapeAnalysis) || _comp->getOption(TR_TraceOSR))
                         {