Clean up redundant copies of Triple objects. NFC

Summary:

Reviewers: rengolin

Reviewed By: rengolin

Subscribers: llvm-commits, rengolin, jholewinski

Differential Revision: http://reviews.llvm.org/D10382

llvm-svn: 239823
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsABIInfo.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsABIInfo.cpp
index bf8f7d1..8e6c9e6 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsABIInfo.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsABIInfo.cpp
@@ -47,7 +47,7 @@
   llvm_unreachable("Unhandled ABI");
 }
 
-MipsABIInfo MipsABIInfo::computeTargetABI(Triple TT, StringRef CPU,
+MipsABIInfo MipsABIInfo::computeTargetABI(const Triple &TT, StringRef CPU,
                                           const MCTargetOptions &Options) {
   if (Options.getABIName().startswith("o32"))
     return MipsABIInfo::O32();