[PowerPC] [NFC] rename PPCLoopPreIncPrep.cpp to PPCLoopInstrFormPrep.cpp after D67088

Summary:
This is NFC code clean work after D67088. In that patch, we extend loop instructions prep for ds/dq form.

This patch only changes the file name PPCLoopPreIncPrep.cpp to PPCLoopInstrFormPrep.cpp for better reviewing of the content change of file PPCLoopInstrFormPrep.cpp.

Reviewers: #powerpc, nemanjai, steven.zhang, shchenz

Reviewed By: #powerpc, shchenz

Subscribers: wuzish, mgorny, hiraditya, kbarton, shchenz, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70716

2 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/CMakeLists.txt b/llvm/lib/Target/PowerPC/CMakeLists.txt
index 28d7840d541..1893d6e32c9 100644
--- a/llvm/lib/Target/PowerPC/CMakeLists.txt
+++ b/llvm/lib/Target/PowerPC/CMakeLists.txt
@@ -29,7 +29,7 @@ add_llvm_target(PowerPCCodeGen
   PPCEarlyReturn.cpp
   PPCFastISel.cpp
   PPCFrameLowering.cpp
-  PPCLoopPreIncPrep.cpp
+  PPCLoopInstrFormPrep.cpp
   PPCMCInstLower.cpp
   PPCMachineFunctionInfo.cpp
   PPCMachineScheduler.cpp
diff --git a/llvm/lib/Target/PowerPC/PPCLoopPreIncPrep.cpp b/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
index 72c347e0051..72c347e0051 100644
--- a/llvm/lib/Target/PowerPC/PPCLoopPreIncPrep.cpp
+++ b/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp