Revert "[optimizing] Enable x86 long support."

Few libcore failures.

This reverts commit b4ba354cf8d22b261205494875cc014f18587b50.

Change-Id: I4a28d853e730dff9b69aec9555505803cf2fcd63
diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index b8f4572..5146afa 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -153,13 +153,17 @@
   virtual size_t SaveCoreRegister(size_t stack_index, uint32_t reg_id) = 0;
   // Restores the register from the stack. Returns the size taken on stack.
   virtual size_t RestoreCoreRegister(size_t stack_index, uint32_t reg_id) = 0;
-
-  virtual size_t SaveFloatingPointRegister(size_t stack_index, uint32_t reg_id) = 0;
-  virtual size_t RestoreFloatingPointRegister(size_t stack_index, uint32_t reg_id) = 0;
-
+  virtual size_t SaveFloatingPointRegister(size_t stack_index, uint32_t reg_id) {
+    UNUSED(stack_index, reg_id);
+    UNIMPLEMENTED(FATAL);
+    UNREACHABLE();
+  }
+  virtual size_t RestoreFloatingPointRegister(size_t stack_index, uint32_t reg_id) {
+    UNUSED(stack_index, reg_id);
+    UNIMPLEMENTED(FATAL);
+    UNREACHABLE();
+  }
   virtual bool NeedsTwoRegisters(Primitive::Type type) const = 0;
-  // Returns whether we should split long moves in parallel moves.
-  virtual bool ShouldSplitLongMoves() const { return false; }
 
   bool IsCoreCalleeSaveRegister(int reg) const {
     return (core_callee_save_mask_ & (1 << reg)) != 0;