[MIPS] Modify LongBranch expansion to work with sandboxing

lib/Target/Mips/MipsMCInstLower.cpp

Index: lib/Target/Mips/MipsMCInstLower.cpp
diff --git a/lib/Target/Mips/MipsMCInstLower.cpp b/lib/Target/Mips/MipsMCInstLower.cpp
index d836975eb7d227a972350120aee3e0c5a6926d8a..639f20c11411ebc4f1996cc6a111a8983eb3247e 100644
--- a/lib/Target/Mips/MipsMCInstLower.cpp
+++ b/lib/Target/Mips/MipsMCInstLower.cpp
@@ -66,6 +66,12 @@ MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
   case MipsII::MO_GOT_LO16:  Kind = MCSymbolRefExpr::VK_Mips_GOT_LO16; break;
   case MipsII::MO_CALL_HI16: Kind = MCSymbolRefExpr::VK_Mips_CALL_HI16; break;
   case MipsII::MO_CALL_LO16: Kind = MCSymbolRefExpr::VK_Mips_CALL_LO16; break;
+  // @LOCALMOD-START
+  case MipsII::MO_NACL_LONG_BRANCH_HI16:
+    Kind = MCSymbolRefExpr::VK_Mips_NACL_LONG_BRANCH_HI16; break;
+  case MipsII::MO_NACL_LONG_BRANCH_LO16:
+    Kind = MCSymbolRefExpr::VK_Mips_NACL_LONG_BRANCH_LO16; break;
+  // @LOCALMOD-END
   }
 
   switch (MOTy) {