Refactor java.lang.reflect implementation

Cherry-picked from commit ed41d5c44299ec5d44b8514f6e17f802f48094d1.

Move to ArtMethod/Field instead of AbstractMethod/Field and have
java.lang.reflect APIs delegate to ArtMethod/ArtField.

Bug: 10014286.

Change-Id: Iafc1d8c5b62562c9af8fb9fd8c5e1d61270536e7
diff --git a/runtime/arch/mips/context_mips.cc b/runtime/arch/mips/context_mips.cc
index a78e5ee..b957708 100644
--- a/runtime/arch/mips/context_mips.cc
+++ b/runtime/arch/mips/context_mips.cc
@@ -16,7 +16,7 @@
 
 #include "context_mips.h"
 
-#include "mirror/abstract_method.h"
+#include "mirror/art_method.h"
 #include "mirror/object-inl.h"
 #include "stack.h"
 
@@ -40,7 +40,7 @@
 }
 
 void MipsContext::FillCalleeSaves(const StackVisitor& fr) {
-  mirror::AbstractMethod* method = fr.GetMethod();
+  mirror::ArtMethod* method = fr.GetMethod();
   uint32_t core_spills = method->GetCoreSpillMask();
   uint32_t fp_core_spills = method->GetFpSpillMask();
   size_t spill_count = __builtin_popcount(core_spills);