gpl: set setSkipIoMode(true) in Replace::getUniformTargetDensity

We may not have placed the bterms yet when -skip_io is about to be
used and this avoids an error (eg 3_1_place_gp_skip_io).

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

src/gpl/src/replace.cpp

@@ -442,6 +442,8 @@ float Replace::getUniformTargetDensity(int threads)
   log_->info(GPL, 22, "Initialize gpl and calculate uniform density.");
   log_->redirectStringBegin();
 
+  setSkipIoMode(true);  // in case bterms are not placed
+
   float density = 1.0f;
   if (initNesterovPlace(threads)) {
     density = nbVec_[0]->getUniformTargetDensity();