Minor fixes to mips64 for the arch-specific optimisation framework.

Change-Id: I9d49ea61c732e4fc6b3393aa8778951e29ce4efe
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 26eee1c..ba787a0 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -917,6 +917,8 @@
 
 #define FOR_EACH_CONCRETE_INSTRUCTION_ARM64(M)
 
+#define FOR_EACH_CONCRETE_INSTRUCTION_MIPS64(M)
+
 #define FOR_EACH_CONCRETE_INSTRUCTION_X86(M)
 
 #define FOR_EACH_CONCRETE_INSTRUCTION_X86_64(M)
@@ -925,6 +927,7 @@
   FOR_EACH_CONCRETE_INSTRUCTION_COMMON(M)                               \
   FOR_EACH_CONCRETE_INSTRUCTION_ARM(M)                                  \
   FOR_EACH_CONCRETE_INSTRUCTION_ARM64(M)                                \
+  FOR_EACH_CONCRETE_INSTRUCTION_MIPS64(M)                               \
   FOR_EACH_CONCRETE_INSTRUCTION_X86(M)                                  \
   FOR_EACH_CONCRETE_INSTRUCTION_X86_64(M)