Delete ArtMethod gc_map_ field

Moved the gc_map field from OatMethod to OatQuickMethodHeader.
Deleted the ArtMethod gc_map_ field.

Bug: 17643507

Change-Id: Ifa0470c3e4c2f8a319744464d94c6838b76b3d48

(cherry picked from commit 807140048f82a2b87ee5bcf337f23b6a3d1d5269)
diff --git a/compiler/common_compiler_test.h b/compiler/common_compiler_test.h
index 20b750c..9cffbc8 100644
--- a/compiler/common_compiler_test.h
+++ b/compiler/common_compiler_test.h
@@ -42,7 +42,7 @@
   ~CommonCompilerTest();
 
   // Create an OatMethod based on pointers (for unit tests).
-  OatFile::OatMethod CreateOatMethod(const void* code, const uint8_t* gc_map);
+  OatFile::OatMethod CreateOatMethod(const void* code);
 
   void MakeExecutable(mirror::ArtMethod* method) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);