Use ScopedArenaAllocator for code generation.

Reuse the memory previously allocated on the ArenaStack by
optimization passes.

This CL handles only the architecture-independent codegen
and slow paths, architecture-dependent codegen allocations
shall be moved to the ScopedArenaAllocator in a follow-up.

Memory needed to compile the two most expensive methods for
aosp_angler-userdebug boot image:
  BatteryStats.dumpCheckinLocked() : 19.6MiB -> 18.5MiB (-1189KiB)
  BatteryStats.dumpLocked(): 39.3MiB -> 37.0MiB (-2379KiB)

Also move definitions of functions that use bit_vector-inl.h
from bit_vector.h also to bit_vector-inl.h .

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 64312607
Change-Id: I84688c3a5a95bf90f56bd3a150bc31fedc95f29c
diff --git a/compiler/optimizing/register_allocation_resolver.cc b/compiler/optimizing/register_allocation_resolver.cc
index 5ed9e02..1d3fe03 100644
--- a/compiler/optimizing/register_allocation_resolver.cc
+++ b/compiler/optimizing/register_allocation_resolver.cc
@@ -16,6 +16,7 @@
 
 #include "register_allocation_resolver.h"
 
+#include "base/bit_vector-inl.h"
 #include "code_generator.h"
 #include "linear_order.h"
 #include "ssa_liveness_analysis.h"