Revert "ART: Compiler support for invoke-polymorphic."

This reverts commit 02e3092f8d98f339588e48691db77f227b48ac1e.

Reasons for revert:

- Breaks MIPS/MIPS64 build.
- Fails under GCStress test on x64.
- Different x64 build configuration doesn't like relocation.

Change-Id: I512555b38165d05f8a07e8aed528f00302061001
diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index 673a661..2e2c3c0 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -427,12 +427,12 @@
   }
 
 
-  // Performs checks pertaining to an InvokeRuntime call.
+  // Perfoms checks pertaining to an InvokeRuntime call.
   void ValidateInvokeRuntime(QuickEntrypointEnum entrypoint,
                              HInstruction* instruction,
                              SlowPathCode* slow_path);
 
-  // Performs checks pertaining to an InvokeRuntimeWithoutRecordingPcInfo call.
+  // Perfoms checks pertaining to an InvokeRuntimeWithoutRecordingPcInfo call.
   static void ValidateInvokeRuntimeWithoutRecordingPcInfo(HInstruction* instruction,
                                                           SlowPathCode* slow_path);
 
@@ -496,8 +496,6 @@
 
   void GenerateInvokeUnresolvedRuntimeCall(HInvokeUnresolved* invoke);
 
-  void GenerateInvokePolymorphicCall(HInvokePolymorphic* invoke);
-
   void CreateUnresolvedFieldLocationSummary(
       HInstruction* field_access,
       Primitive::Type field_type,