Do not emit stack maps for runtime calls to ReadBarrierMarkRegX.

* Boot image code size variation on Nexus 5X
  (aosp_bullhead-userdebug build):
  - total ARM64 framework Oat files size change:
    115584120 bytes -> 109124728 bytes (-5.59%)
  - total ARM framework Oat files size change:
    97387728 bytes -> 92517584 (-5.00%)

Test: ART host and target (ARM, ARM64) tests.
Bug: 29506760
Bug: 12687968
Change-Id: I979d9fb2b4e09f4c0c7bf33af2cd91750a67f989
diff --git a/compiler/optimizing/code_generator_x86_64.h b/compiler/optimizing/code_generator_x86_64.h
index d7cfd37..cf92d68 100644
--- a/compiler/optimizing/code_generator_x86_64.h
+++ b/compiler/optimizing/code_generator_x86_64.h
@@ -318,6 +318,12 @@
                      uint32_t dex_pc,
                      SlowPathCode* slow_path);
 
+  // Generate code to invoke a runtime entry point, but do not record
+  // PC-related information in a stack map.
+  void InvokeRuntimeWithoutRecordingPcInfo(int32_t entry_point_offset,
+                                           HInstruction* instruction,
+                                           SlowPathCode* slow_path);
+
   size_t GetWordSize() const OVERRIDE {
     return kX86_64WordSize;
   }