Revert "VIXL simulator for ART (Stage1)"

This reverts commit 48ca6a681efe1fa1cf82d8af918bf9bbfd35ae96.

Reason for revert: broken build 6685551 on aosp-master on full-eng
Bug: 161440641

Change-Id: I849fe53f56c4786f0f2a1605cbfd215559f11072
diff --git a/runtime/oat_file_manager.cc b/runtime/oat_file_manager.cc
index 1480c1d..85992ea 100644
--- a/runtime/oat_file_manager.cc
+++ b/runtime/oat_file_manager.cc
@@ -236,10 +236,10 @@
     std::unique_ptr<ClassLoaderContext> context(
         ClassLoaderContext::CreateContextForClassLoader(class_loader, dex_elements));
 
-  OatFileAssistant oat_file_assistant(dex_location,
-                                      Runtime::GetQuickCodeISA(),
-                                      runtime->GetOatFilesExecutable(),
-                                      only_use_system_oat_files_);
+    OatFileAssistant oat_file_assistant(dex_location,
+                                        kRuntimeISA,
+                                        runtime->GetOatFilesExecutable(),
+                                        only_use_system_oat_files_);
 
     // Get the oat file on disk.
     std::unique_ptr<const OatFile> oat_file(oat_file_assistant.GetBestOatFile().release());