[Lanai] Remove unused forward declarations. NFC.

llvm/lib/Target/Lanai/Lanai.h

@@ -19,9 +19,6 @@
 namespace llvm {
 class FunctionPass;
 class LanaiTargetMachine;
-class MachineFunctionPass;
-class TargetMachine;
-class formatted_raw_ostream;
 
 // createLanaiISelDag - This pass converts a legalized DAG into a
 // Lanai-specific DAG, ready for instruction scheduling.

llvm/lib/Target/Lanai/LanaiMCInstLower.h

@@ -18,9 +18,7 @@ class MCInst;
 class MCOperand;
 class MCSymbol;
 class MachineInstr;
-class MachineModuleInfoMachO;
 class MachineOperand;
-class Mangler;
 
 // LanaiMCInstLower - This class is used to lower an MachineInstr
 // into an MCInst.

llvm/lib/Target/Lanai/LanaiTargetMachine.h

@@ -22,7 +22,6 @@
 #include "llvm/Target/TargetMachine.h"
 
 namespace llvm {
-class formatted_raw_ostream;
 
 class LanaiTargetMachine : public LLVMTargetMachine {
   LanaiSubtarget Subtarget;

llvm/lib/Target/Lanai/LanaiTargetObjectFile.h

@@ -12,7 +12,6 @@
 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
 
 namespace llvm {
-class LanaiTargetMachine;
 class LanaiTargetObjectFile : public TargetLoweringObjectFileELF {
   MCSection *SmallDataSection;
   MCSection *SmallBSSSection;