Add -XX:+DisableExplicitGC option for Art

Phone boots.  Also removed elfwriter spam from logcat.

Change-Id: I09b9d2fc40ebfeb6f1c2f12153b0ad4134bb5159
diff --git a/compiler/elf_writer_quick.cc b/compiler/elf_writer_quick.cc
index 29963fe..014c51e 100644
--- a/compiler/elf_writer_quick.cc
+++ b/compiler/elf_writer_quick.cc
@@ -661,7 +661,7 @@
     return false;
   }
 
-  LOG(INFO) << "ELF file written successfully: " << elf_file_->GetPath();
+  VLOG(compiler) << "ELF file written successfully: " << elf_file_->GetPath();
   return true;
 }