SwitchLoweringUtils.h - reduce TargetLowering.h include. NFCI.

Only include the headers we actually need, and move the remaining includes down to implicit dependent files.

llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h

@@ -38,6 +38,7 @@ class BasicBlock;
 class CallInst;
 class CallLowering;
 class Constant;
+class ConstrainedFPIntrinsic;
 class DataLayout;
 class Instruction;
 class MachineBasicBlock;

llvm/include/llvm/CodeGen/SwitchLoweringUtils.h

@@ -10,16 +10,21 @@
 #define LLVM_CODEGEN_SWITCHLOWERINGUTILS_H
 
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/ISDOpcodes.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
-#include "llvm/CodeGen/TargetLowering.h"
-#include "llvm/IR/Constants.h"
+#include "llvm/IR/InstrTypes.h"
 #include "llvm/Support/BranchProbability.h"
+#include <vector>
 
 namespace llvm {
 
+class BlockFrequencyInfo;
+class ConstantInt;
 class FunctionLoweringInfo;
 class MachineBasicBlock;
-class BlockFrequencyInfo;
+class ProfileSummaryInfo;
+class TargetLowering;
+class TargetMachine;
 
 namespace SwitchCG {
 

llvm/lib/CodeGen/SwitchLoweringUtils.cpp

@@ -14,6 +14,7 @@
 #include "llvm/CodeGen/SwitchLoweringUtils.h"
 #include "llvm/CodeGen/FunctionLoweringInfo.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/TargetLowering.h"
 #include "llvm/Target/TargetMachine.h"
 
 using namespace llvm;