Revert "Revert "ART: Add Mterp export pc poison testing mode""

This reverts commit d7af522c0f03cd926b13bbef7c21a8a504969f36.

Fixes mips assembly typo: "mov" -> "move"

TEST: Previously tested arm/arm64/x86/x86_64 via test-art-host,
test-art-target plus injected error.  Neglected to test mips
builds.  Now those tested as well.

Change-Id: If2f9fb06973f8c1220a7d7699d79e6b9f1ce3197
diff --git a/runtime/interpreter/mterp/mterp.h b/runtime/interpreter/mterp/mterp.h
index 8d24641..88e17bc 100644
--- a/runtime/interpreter/mterp/mterp.h
+++ b/runtime/interpreter/mterp/mterp.h
@@ -32,6 +32,13 @@
 void CheckMterpAsmConstants();
 extern "C" bool MterpShouldSwitchInterpreters();
 
+// Poison value for TestExportPC.  If we segfault with this value, it means that a mterp
+// handler for a recent opcode failed to export the Dalvik PC prior to a possible exit from
+// the mterp environment.
+constexpr uintptr_t kExportPCPoison = 0xdead00ff;
+// Set true to enable poison testing of ExportPC.  Uses Alt interpreter.
+constexpr bool kTestExportPC = false;
+
 }  // namespace interpreter
 }  // namespace art