Revert "Revert "Store resolved Strings for AOT code in .bss.""

Fixed oat_test to keep dex files alive. Fixed mips build.
Rewritten the .bss GC root visiting and added write barrier
to the artResolveStringFromCode().

Test: build aosp_mips-eng
Test: m ART_DEFAULT_GC_TYPE=SS test-art-target-host-gtest-oat_test
Test: Run ART test suite on host and Nexus 9.
Bug: 20323084
Bug: 30627598

This reverts commit 5f926055cb88089d8ca27243f35a9dfd89d981f0.

Change-Id: I07fa2278d82b8eb64964c9a4b66cb93726ccda6b
diff --git a/compiler/common_compiler_test.cc b/compiler/common_compiler_test.cc
index b726649..bc8facd 100644
--- a/compiler/common_compiler_test.cc
+++ b/compiler/common_compiler_test.cc
@@ -174,13 +174,12 @@
 void CommonCompilerTest::CreateCompilerDriver(Compiler::Kind kind,
                                               InstructionSet isa,
                                               size_t number_of_threads) {
+  compiler_options_->boot_image_ = true;
   compiler_driver_.reset(new CompilerDriver(compiler_options_.get(),
                                             verification_results_.get(),
                                             kind,
                                             isa,
                                             instruction_set_features_.get(),
-                                            /* boot_image */ true,
-                                            /* app_image */ false,
                                             GetImageClasses(),
                                             GetCompiledClasses(),
                                             GetCompiledMethods(),