Revert "Revert "Avoid compiling monster methods in boot image""

This reverts commit f679fab9be8905505d26a62bea257641f0bb0168.

(cherry picked from commit 9d0bdfe63bec5a43d7668d9094a52caf77b6ed53)

Change-Id: I72af1d44483edbd2a5f2e6b678e43f740d4613fd
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index afa8495..ec2713a 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -993,7 +993,7 @@
 
   if (compiler_filter_string == NULL) {
     if (image) {
-      compiler_filter_string = "everything";
+      compiler_filter_string = "speed";
     } else {
 #if ART_SMALL_MODE
       compiler_filter_string = "interpret-only";