[Transforms] Remove unused forward declarations (NFC)

Author: kazutakahirata

llvm/include/llvm/Transforms/HipStdPar/HipStdPar.h

@@ -23,7 +23,6 @@
 namespace llvm {
 
 class Module;
-class ModuleAnaysisManager;
 
 class HipStdParAcceleratorCodeSelectionPass
   : public PassInfoMixin<HipStdParAcceleratorCodeSelectionPass> {

llvm/include/llvm/Transforms/IPO/EmbedBitcodePass.h

@@ -22,7 +22,6 @@
 
 namespace llvm {
 class Module;
-class ModulePass;
 class Pass;
 
 /// Pass embeds a copy of the module optimized with the provided pass pipeline

llvm/include/llvm/Transforms/Instrumentation/MemProfiler.h

@@ -17,9 +17,7 @@
 
 namespace llvm {
 class Function;
-class FunctionPass;
 class Module;
-class ModulePass;
 
 namespace vfs {
 class FileSystem;

llvm/include/llvm/Transforms/Scalar/Scalarizer.h

@@ -24,7 +24,6 @@
 namespace llvm {
 
 class Function;
-class FunctionPass;
 
 struct ScalarizerPassOptions {
   // These options correspond 1:1 to cl::opt options defined in

llvm/include/llvm/Transforms/Scalar/SimpleLoopUnswitch.h

@@ -17,7 +17,6 @@ namespace llvm {
 
 class LPMUpdater;
 class Loop;
-class Pass;
 class StringRef;
 class raw_ostream;
 

llvm/include/llvm/Transforms/Utils/ValueMapper.h

@@ -22,7 +22,6 @@
 namespace llvm {
 
 class Constant;
-class DIBuilder;
 class DPValue;
 class Function;
 class GlobalVariable;

llvm/lib/Transforms/InstCombine/InstCombineNegator.cpp

@@ -47,9 +47,7 @@
 #include <utility>
 
 namespace llvm {
-class AssumptionCache;
 class DataLayout;
-class DominatorTree;
 class LLVMContext;
 } // namespace llvm
 

llvm/lib/Transforms/Vectorize/VPlanAnalysis.h

@@ -16,12 +16,9 @@ namespace llvm {
 class LLVMContext;
 class VPValue;
 class VPBlendRecipe;
-class VPInterleaveRecipe;
 class VPInstruction;
-class VPReductionPHIRecipe;
 class VPWidenRecipe;
 class VPWidenCallRecipe;
-class VPWidenCastRecipe;
 class VPWidenIntOrFpInductionRecipe;
 class VPWidenMemoryInstructionRecipe;
 struct VPWidenSelectRecipe;

llvm/lib/Transforms/Vectorize/VPlanTransforms.h

@@ -22,11 +22,9 @@ class InductionDescriptor;
 class Instruction;
 class PHINode;
 class ScalarEvolution;
-class Loop;
 class PredicatedScalarEvolution;
 class TargetLibraryInfo;
 class VPBuilder;
-class VPRecipeBuilder;
 
 struct VPlanTransforms {
   /// Replaces the VPInstructions in \p Plan with corresponding