Re-land r335038 "[llvm-exegesis] A mechanism to add target-specific functionality.""

Fix typo: LLVM_NATIVE_ARCH -> LLVM_EXEGESIS_NATIVE_ARCH.

llvm-svn: 335041
diff --git a/llvm/tools/llvm-exegesis/lib/Uops.cpp b/llvm/tools/llvm-exegesis/lib/Uops.cpp
index 4c6edaa..581b855 100644
--- a/llvm/tools/llvm-exegesis/lib/Uops.cpp
+++ b/llvm/tools/llvm-exegesis/lib/Uops.cpp
@@ -97,8 +97,7 @@
     return llvm::make_error<BenchmarkFailure>(
         "Infeasible : has unknown operands");
   if (llvm::any_of(MCInstrDesc.operands(), hasMemoryOperand))
-    return llvm::make_error<BenchmarkFailure>(
-        "Infeasible : has memory operands");
+    return llvm::make_error<BenchmarkFailure>("Infeasible : has memory operands");
   return llvm::Error::success();
 }