Revert "Revert "Add MIPS64r6 support for libpixelflinger""

This reverts commit 7fd121788a892a0dfd4a9594304cad85fe366349.

Change-Id: Ic1204a8407c235b07c643764d5f2800631fecd72
diff --git a/libpixelflinger/codeflinger/ARMAssemblerInterface.h b/libpixelflinger/codeflinger/ARMAssemblerInterface.h
index 40cbfcf..72935ac 100644
--- a/libpixelflinger/codeflinger/ARMAssemblerInterface.h
+++ b/libpixelflinger/codeflinger/ARMAssemblerInterface.h
@@ -63,7 +63,7 @@
     };
 
     enum {
-        CODEGEN_ARCH_ARM = 1, CODEGEN_ARCH_MIPS, CODEGEN_ARCH_ARM64
+        CODEGEN_ARCH_ARM = 1, CODEGEN_ARCH_MIPS, CODEGEN_ARCH_ARM64, CODEGEN_ARCH_MIPS64
     };
 
     // -----------------------------------------------------------------------
@@ -115,7 +115,8 @@
     // data processing...
     enum {
         opAND, opEOR, opSUB, opRSB, opADD, opADC, opSBC, opRSC, 
-        opTST, opTEQ, opCMP, opCMN, opORR, opMOV, opBIC, opMVN
+        opTST, opTEQ, opCMP, opCMN, opORR, opMOV, opBIC, opMVN,
+        opADD64, opSUB64
     };
 
     virtual void