Create a scoped arena allocator and use that for LVN.

This saves more than 0.5s of boot.oat compilation time
on Nexus 5.

TODO: Move other stuff to the scoped allocator. This CL
alone increases the peak memory allocation. By reusing
the memory for other parts of the compilation we should
reduce this overhead.

Change-Id: Ifbc00aab4f3afd0000da818dfe68b96713824a08

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/dex/quick/ralloc_util.cc b/compiler/dex/quick/ralloc_util.cc
index 3a8942e46e..3cb6fd01c1 100644
--- a/compiler/dex/quick/ralloc_util.cc
+++ b/compiler/dex/quick/ralloc_util.cc
@@ -907,7 +907,7 @@ void Mir2Lir::DoPromotion() {
   const int promotion_threshold = 1;
   // Allocate the promotion map - one entry for each Dalvik vReg or compiler temp
   promotion_map_ = static_cast<PromotionMap*>
-      (arena_->Alloc(num_regs * sizeof(promotion_map_[0]), ArenaAllocator::kAllocRegAlloc));
+      (arena_->Alloc(num_regs * sizeof(promotion_map_[0]), kArenaAllocRegAlloc));
 
   // Allow target code to add any special registers
   AdjustSpillMask();
@@ -925,10 +925,10 @@ void Mir2Lir::DoPromotion() {
    */
   RefCounts *core_regs =
       static_cast<RefCounts*>(arena_->Alloc(sizeof(RefCounts) * num_regs,
-                                            ArenaAllocator::kAllocRegAlloc));
+                                            kArenaAllocRegAlloc));
   RefCounts *FpRegs =
       static_cast<RefCounts *>(arena_->Alloc(sizeof(RefCounts) * num_regs * 2,
-                                             ArenaAllocator::kAllocRegAlloc));
+                                             kArenaAllocRegAlloc));
   // Set ssa names for original Dalvik registers
   for (int i = 0; i < dalvik_regs; i++) {
     core_regs[i].s_reg = FpRegs[i].s_reg = i;