MIPS switch table support

And 64-bit neg/add/sub (ouch! Mips has no carry bit...)

Change-Id: Ifb94324a0052d6069977fb8f22679b95890445d8
diff --git a/src/compiler/CompilerIR.h b/src/compiler/CompilerIR.h
index 013fd1d..4c8bd44 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -482,7 +482,7 @@
     int offset;
     const u2* table;            // Original dex table
     int vaddr;                  // Dalvik offset of switch opcode
-    LIR* bxInst;                // Switch indirect branch instruction
+    LIR* anchor;                // Reference instruction for relative offsets
     LIR** targets;              // Array of case targets
 } SwitchTable;