Move assembler out of runtime into compiler/utils.

Other directory layout bits of clean up. There is still work to separate quick
and portable in some files (e.g. argument visitor, proxy..).

Change-Id: If8fecffda8ba5c4c47a035f0c622c538c6b58351
diff --git a/compiler/dex/quick/mips/fp_mips.cc b/compiler/dex/quick/mips/fp_mips.cc
index 6cd9acc..620527e 100644
--- a/compiler/dex/quick/mips/fp_mips.cc
+++ b/compiler/dex/quick/mips/fp_mips.cc
@@ -16,8 +16,8 @@
 
 #include "codegen_mips.h"
 #include "dex/quick/mir_to_lir-inl.h"
+#include "entrypoints/quick/quick_entrypoints.h"
 #include "mips_lir.h"
-#include "oat/runtime/oat_support_entrypoints.h"
 
 namespace art {