RFR: Remove unused ShPacer::setup_for_partial

[Aleksey Shipilev]

This is unused after Traversal-Partial folding. And Pacer already tracks the traversal progress as
"live" data expected during this cycle. Let's remove it:

diff -r 96c558dcd234 src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp       Wed Sep 05 10:46:40 2018 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp       Wed Sep 05 11:12:59 2018 +0200
@@ -141,35 +141,10 @@
                      "M, Non-Taxable: " SIZE_FORMAT "M, Alloc Tax Rate: %.1fx",
                      live / M, free / M, non_taxable / M, tax);
 }

 /*
- * Partial collection walks only the part of the heap. Incoming arugment will tell us how much
- * work the heuristics is expecting us to do. We would use that as the baseline.
- */
-
-void ShenandoahPacer::setup_for_partial(size_t work_words) {
-  assert(ShenandoahPacing, "Only be here when pacing is enabled");
-
-  size_t work_bytes = work_words * HeapWordSize;
-  size_t free = _heap->free_set()->available();
-
-  size_t non_taxable = free * ShenandoahPacingCycleSlack / 100;
-  size_t taxable = free - non_taxable;
-
-  double tax = 1.0 * work_bytes / taxable; // base tax for available free space
-  tax = MAX2<double>(1, tax);              // never allocate more than GC collects during the cycle
-  tax *= ShenandoahPacingSurcharge;        // additional surcharge to help unclutter heap
-
-  restart_with(non_taxable, tax);
-
-  log_info(gc, ergo)("Pacer for Partial. Work: " SIZE_FORMAT "M, Free: " SIZE_FORMAT
-                     "M, Non-Taxable: " SIZE_FORMAT "M, Alloc Tax Rate: %.1fx",
-                     work_bytes / M, free / M, non_taxable / M, tax);
-}
-
-/*
  * In idle phase, we have to pace the application to let control thread react with GC start.
  *
  * Here, we have rendezvous with concurrent thread that adds up the budget as it acknowledges
  * it had seen recent allocations. It will naturally pace the allocations if control thread is
  * not catching up. To bootstrap this feedback cycle, we need to start with some initial budget
diff -r 96c558dcd234 src/hotspot/share/gc/shenandoah/shenandoahPacer.hpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahPacer.hpp       Wed Sep 05 10:46:40 2018 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahPacer.hpp       Wed Sep 05 11:12:59 2018 +0200
@@ -59,11 +59,10 @@

   void setup_for_idle();
   void setup_for_mark();
   void setup_for_evac();
   void setup_for_updaterefs();
-  void setup_for_partial(size_t work_words);
   void setup_for_traversal();

   inline void report_mark(size_t words);
   inline void report_evac(size_t words);
   inline void report_updaterefs(size_t words);


Testing: tier1_gc_shenandoah

Thanks,
-Aleksey