(mips) adding simulator support for AUI/DAUI/DAHI/DATI instructions.

src/mips/simulator-mips.cc

Index: src/mips/simulator-mips.cc
diff --git a/src/mips/simulator-mips.cc b/src/mips/simulator-mips.cc
index b50a792d9d7123f5f7c1e325343d3514d9f03785..e52b3833b4856fcfd599b40a0348c87ca955c9f2 100644
--- a/src/mips/simulator-mips.cc
+++ b/src/mips/simulator-mips.cc
@@ -4044,7 +4044,14 @@ void Simulator::DecodeTypeImmediate(Instruction* instr) {
       SetResult(rt_reg, rs ^ oe_imm16);
       break;
     case LUI:
-      SetResult(rt_reg, oe_imm16 << 16);
+      if (rs_reg != 0) {
+        // AUI
+        DCHECK(IsMipsArchVariant(kMips32r6));
+        SetResult(rt_reg, rs + (se_imm16 << 16));
+      } else {
+        // LUI
+        SetResult(rt_reg, oe_imm16 << 16);
+      }
       break;
     // ------------- Memory instructions.
     case LB: