[llvm-mca] PR39261: Rename FetchStage to EntryStage.

This fixes PR39261.

FetchStage is a misnomer. It causes confusion with the frontend fetch stage,
which we don't currently simulate.  I decided to rename it into EntryStage
mainly because this is meant to be a "source" stage for all pipelines.

Differential Revision: https://reviews.llvm.org/D54268

llvm-svn: 346419
diff --git a/llvm/tools/llvm-mca/llvm-mca.cpp b/llvm/tools/llvm-mca/llvm-mca.cpp
index d8bbcb9..a105e7c 100644
--- a/llvm/tools/llvm-mca/llvm-mca.cpp
+++ b/llvm/tools/llvm-mca/llvm-mca.cpp
@@ -24,7 +24,7 @@
 #include "CodeRegion.h"
 #include "CodeRegionGenerator.h"
 #include "PipelinePrinter.h"
-#include "Stages/FetchStage.h"
+#include "Stages/EntryStage.h"
 #include "Stages/InstructionTables.h"
 #include "Views/DispatchStatistics.h"
 #include "Views/InstructionInfoView.h"
@@ -434,7 +434,7 @@
     if (PrintInstructionTables) {
       //  Create a pipeline, stages, and a printer.
       auto P = make_unique<mca::Pipeline>();
-      P->appendStage(make_unique<mca::FetchStage>(S));
+      P->appendStage(make_unique<mca::EntryStage>(S));
       P->appendStage(make_unique<mca::InstructionTables>(SM));
       mca::PipelinePrinter Printer(*P);