Add Handle/HandleScope and delete SirtRef.

Delete SirtRef and replaced it with Handle. Handles are value types
which wrap around StackReference*.

Renamed StackIndirectReferenceTable to HandleScope.

Added a scoped handle wrapper which wraps around an Object** and
restores it in its destructor.

Renamed Handle::get -> Get.

Bug: 8473721

Change-Id: Idbfebd4f35af629f0f43931b7c5184b334822c7a
diff --git a/compiler/jni/quick/calling_convention.cc b/compiler/jni/quick/calling_convention.cc
index a99a4c2..95c2d40 100644
--- a/compiler/jni/quick/calling_convention.cc
+++ b/compiler/jni/quick/calling_convention.cc
@@ -126,8 +126,8 @@
 }
 
 FrameOffset JniCallingConvention::SavedLocalReferenceCookieOffset() const {
-  size_t references_size = sirt_pointer_size_ * ReferenceCount();  // size excluding header
-  return FrameOffset(SirtReferencesOffset().Int32Value() + references_size);
+  size_t references_size = handle_scope_pointer_size_ * ReferenceCount();  // size excluding header
+  return FrameOffset(HandleerencesOffset().Int32Value() + references_size);
 }
 
 FrameOffset JniCallingConvention::ReturnValueSaveLocation() const {
@@ -219,13 +219,13 @@
   }
 }
 
-// Return position of SIRT entry holding reference at the current iterator
+// Return position of handle scope entry holding reference at the current iterator
 // position
-FrameOffset JniCallingConvention::CurrentParamSirtEntryOffset() {
+FrameOffset JniCallingConvention::CurrentParamHandleScopeEntryOffset() {
   CHECK(IsCurrentParamAReference());
-  CHECK_LT(SirtLinkOffset(), SirtNumRefsOffset());
-  int result = SirtReferencesOffset().Int32Value() + itr_refs_ * sirt_pointer_size_;
-  CHECK_GT(result, SirtNumRefsOffset().Int32Value());
+  CHECK_LT(HandleScopeLinkOffset(), HandleScopeNumRefsOffset());
+  int result = HandleerencesOffset().Int32Value() + itr_refs_ * handle_scope_pointer_size_;
+  CHECK_GT(result, HandleScopeNumRefsOffset().Int32Value());
   return FrameOffset(result);
 }