ART: Add support for patching and loading OAT files compiled with PIC

* Images (.art) compiled with pic now have a new field added.
* isDexOptNeeded will now skip patch-ing for apps compiled PIC
* First-boot patching now only copies boot.art, boot.oat is linked

As a result, all system preopted dex files (with --compile-pic) no
longer take up any space in /data/dalvik-cache/<isa>.

(cherry-picked from AOSP master
46774767fcf7780d1455e755729198648d08742e)

Conflicts (from aosp master):
	compiler/image_test.cc
	compiler/image_writer.cc
	compiler/image_writer.h
	compiler/oat_test.cc
	dex2oat/dex2oat.cc
	oatdump/oatdump.cc
	runtime/elf_file.cc
	runtime/elf_file.h
	runtime/elf_file_impl.h
	runtime/oat_file.cc
	runtime/oat_file.h

Bug: 18035729
Change-Id: Ie1acad81a0fd8b2f24e1f3f07a06e6fdb548be62
diff --git a/compiler/image_test.cc b/compiler/image_test.cc
index 355036b..0aef512 100644
--- a/compiler/image_test.cc
+++ b/compiler/image_test.cc
@@ -98,7 +98,7 @@
   {
     ImageWriter writer(*compiler_driver_.get());
     bool success_image = writer.Write(image_file.GetFilename(), requested_image_base,
-                                      dup_oat->GetPath(), dup_oat->GetPath());
+                                      dup_oat->GetPath(), dup_oat->GetPath(), /*compile_pic*/false);
     ASSERT_TRUE(success_image);
     bool success_fixup = ElfFixup::Fixup(dup_oat.get(), writer.GetOatDataBegin());
     ASSERT_TRUE(success_fixup);
@@ -210,7 +210,8 @@
                              oat_file_begin,
                              oat_data_begin,
                              oat_data_end,
-                             oat_file_end);
+                             oat_file_end,
+                             /*compile_pic*/false);
     ASSERT_TRUE(image_header.IsValid());
 
     char* magic = const_cast<char*>(image_header.GetMagic());