Add x86 implementation for nterp.

Bug: 112676029
Test: test.py, run-libcore-tests, run-libjdwp-tests
Change-Id: I06bd2c9dde6834f371f042fadda2ced23e02b7ed
diff --git a/runtime/interpreter/mterp/nterp.cc b/runtime/interpreter/mterp/nterp.cc
index f45e45c..5fc3609 100644
--- a/runtime/interpreter/mterp/nterp.cc
+++ b/runtime/interpreter/mterp/nterp.cc
@@ -754,5 +754,9 @@
   return MterpDoSparseSwitch(switchData, testVal);
 }
 
+extern "C" void NterpFree(void* val) {
+  free(val);
+}
+
 }  // namespace interpreter
 }  // namespace art