Replace string GNU Triples with llvm::Triple in computeDataLayout(). NFC.

Summary:
This continues the patch series to eliminate StringRef forms of GNU triples
from the internals of LLVM that began in r239036.

Reviewers: rengolin

Reviewed By: rengolin

Subscribers: llvm-commits, jfb, rengolin

Differential Revision: http://reviews.llvm.org/D10361

llvm-svn: 239538
diff --git a/llvm/lib/Target/Mips/MipsTargetMachine.cpp b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
index aed15a0..7d003f5 100644
--- a/llvm/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
@@ -44,12 +44,11 @@
   RegisterTargetMachine<MipselTargetMachine> B(TheMips64elTarget);
 }
 
-static std::string computeDataLayout(StringRef TT, StringRef CPU,
+static std::string computeDataLayout(const Triple &TT, StringRef CPU,
                                      const TargetOptions &Options,
                                      bool isLittle) {
   std::string Ret = "";
-  MipsABIInfo ABI =
-      MipsABIInfo::computeTargetABI(Triple(TT), CPU, Options.MCOptions);
+  MipsABIInfo ABI = MipsABIInfo::computeTargetABI(TT, CPU, Options.MCOptions);
 
   // There are both little and big endian mips.
   if (isLittle)
@@ -88,8 +87,9 @@
                                      const TargetOptions &Options,
                                      Reloc::Model RM, CodeModel::Model CM,
                                      CodeGenOpt::Level OL, bool isLittle)
-    : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options, isLittle), TT,
-                        CPU, FS, Options, RM, CM, OL),
+    : LLVMTargetMachine(T,
+                        computeDataLayout(Triple(TT), CPU, Options, isLittle),
+                        TT, CPU, FS, Options, RM, CM, OL),
       isLittle(isLittle), TLOF(make_unique<MipsTargetObjectFile>()),
       ABI(MipsABIInfo::computeTargetABI(Triple(TT), CPU, Options.MCOptions)),
       Subtarget(nullptr),