[llvm] Migrate llvm::make_unique to std::make_unique

Now that we've moved to C++14, we no longer need the llvm::make_unique
implementation from STLExtras.h. This patch is a mechanical replacement
of (hopefully) all the llvm::make_unique instances across the monorepo.

llvm-svn: 369013
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 93a2dd3..efa56fc 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -632,7 +632,7 @@
 
   static std::unique_ptr<RISCVOperand> createToken(StringRef Str, SMLoc S,
                                                    bool IsRV64) {
-    auto Op = make_unique<RISCVOperand>(Token);
+    auto Op = std::make_unique<RISCVOperand>(Token);
     Op->Tok = Str;
     Op->StartLoc = S;
     Op->EndLoc = S;
@@ -642,7 +642,7 @@
 
   static std::unique_ptr<RISCVOperand> createReg(unsigned RegNo, SMLoc S,
                                                  SMLoc E, bool IsRV64) {
-    auto Op = make_unique<RISCVOperand>(Register);
+    auto Op = std::make_unique<RISCVOperand>(Register);
     Op->Reg.RegNum = RegNo;
     Op->StartLoc = S;
     Op->EndLoc = E;
@@ -652,7 +652,7 @@
 
   static std::unique_ptr<RISCVOperand> createImm(const MCExpr *Val, SMLoc S,
                                                  SMLoc E, bool IsRV64) {
-    auto Op = make_unique<RISCVOperand>(Immediate);
+    auto Op = std::make_unique<RISCVOperand>(Immediate);
     Op->Imm.Val = Val;
     Op->StartLoc = S;
     Op->EndLoc = E;
@@ -662,7 +662,7 @@
 
   static std::unique_ptr<RISCVOperand>
   createSysReg(StringRef Str, SMLoc S, unsigned Encoding, bool IsRV64) {
-    auto Op = make_unique<RISCVOperand>(SystemRegister);
+    auto Op = std::make_unique<RISCVOperand>(SystemRegister);
     Op->SysReg.Data = Str.data();
     Op->SysReg.Length = Str.size();
     Op->SysReg.Encoding = Encoding;