Kill off LiveRangeEdit::getNewVRegs and LiveRangeEdit::getUselessVRegs. These
methods are no longer needed now that LinearScan has gone away.

(Contains tweaks trivialSpillEverywhere to enable the removal of getNewVRegs).

llvm-svn: 151658
diff --git a/llvm/lib/CodeGen/RegAllocBasic.cpp b/llvm/lib/CodeGen/RegAllocBasic.cpp
index d1b289b..2e79c79 100644
--- a/llvm/lib/CodeGen/RegAllocBasic.cpp
+++ b/llvm/lib/CodeGen/RegAllocBasic.cpp
@@ -187,7 +187,7 @@
     unassign(SpilledVReg, PhysReg);
 
     // Spill the extracted interval.
-    LiveRangeEdit LRE(SpilledVReg, SplitVRegs, 0, &PendingSpills);
+    LiveRangeEdit LRE(SpilledVReg, SplitVRegs);
     spiller().spill(LRE);
   }
   // After extracting segments, the query's results are invalid. But keep the