[AMDGPU] Move AMDGPUTargetMachine into AMDGPUCodeGenPassBuilder(NFC)

This will allow us to reuse the existing flags and the static
functions while building the pipeline for new pass manager.

Author: cdevadas

llvm/lib/Target/AMDGPU/AMDGPUAlwaysInlinePass.cpp

@@ -13,7 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "AMDGPU.h"
-#include "AMDGPUTargetMachine.h"
+#include "AMDGPUCodeGenPassBuilder.h"
 #include "Utils/AMDGPUBaseInfo.h"
 #include "llvm/CodeGen/CommandFlags.h"
 #include "llvm/IR/Module.h"

llvm/lib/Target/AMDGPU/AMDGPUArgumentUsageInfo.cpp

@@ -8,7 +8,7 @@
 
 #include "AMDGPUArgumentUsageInfo.h"
 #include "AMDGPU.h"
-#include "AMDGPUTargetMachine.h"
+#include "AMDGPUCodeGenPassBuilder.h"
 #include "MCTargetDesc/AMDGPUMCTargetDesc.h"
 #include "SIRegisterInfo.h"
 #include "llvm/CodeGen/TargetRegisterInfo.h"

llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp

@@ -14,8 +14,8 @@
 
 #include "AMDGPUCallLowering.h"
 #include "AMDGPU.h"
+#include "AMDGPUCodeGenPassBuilder.h"
 #include "AMDGPULegalizerInfo.h"
-#include "AMDGPUTargetMachine.h"
 #include "SIMachineFunctionInfo.h"
 #include "SIRegisterInfo.h"
 #include "llvm/CodeGen/Analysis.h"