MIPS: Assemblers changes needed for optimizing compiler

Also add assembler tests for MIPS32.

Change-Id: I3ab1fba7f3b06eb3b5058861946d675494a30775
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 96e13ac..8e3b555 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -210,7 +210,8 @@
   dex/quick/arm64/arm64_lir.h
 
 LIBART_COMPILER_ENUM_OPERATOR_OUT_HEADER_FILES_mips := \
-  dex/quick/mips/mips_lir.h
+  dex/quick/mips/mips_lir.h \
+  utils/mips/assembler_mips.h
 
 LIBART_COMPILER_ENUM_OPERATOR_OUT_HEADER_FILES_mips64 := \
   $(LIBART_COMPILER_ENUM_OPERATOR_OUT_HEADER_FILES_mips)