Move InterpreterCache::{Get,Set} to inl.h file

Trivial code movement.

Test: test.py -b -r --host
Change-Id: I1d671aae41bae081e7943b3124edd75ae128a1ef
diff --git a/runtime/interpreter/mterp/nterp.cc b/runtime/interpreter/mterp/nterp.cc
index 89e6a13..bd5636c 100644
--- a/runtime/interpreter/mterp/nterp.cc
+++ b/runtime/interpreter/mterp/nterp.cc
@@ -24,6 +24,7 @@
 #include "dex/dex_instruction_utils.h"
 #include "debugger.h"
 #include "entrypoints/entrypoint_utils-inl.h"
+#include "interpreter/interpreter_cache-inl.h"
 #include "interpreter/interpreter_common.h"
 #include "interpreter/interpreter_intrinsics.h"
 #include "interpreter/shadow_frame-inl.h"