X86: Clean up pass initialization

Summary:
- Remove redundant initializations from pass constructors that were
  already being initialized by LLVMInitializeX86Target().

- Add initialization function for the FPS pass.

Reviewers: craig.topper

Reviewed By: craig.topper

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63218

llvm-svn: 363221
diff --git a/llvm/lib/Target/X86/X86CondBrFolding.cpp b/llvm/lib/Target/X86/X86CondBrFolding.cpp
index 932b3af..9dea94f 100644
--- a/llvm/lib/Target/X86/X86CondBrFolding.cpp
+++ b/llvm/lib/Target/X86/X86CondBrFolding.cpp
@@ -61,9 +61,7 @@
 namespace {
 class X86CondBrFoldingPass : public MachineFunctionPass {
 public:
-  X86CondBrFoldingPass() : MachineFunctionPass(ID) {
-    initializeX86CondBrFoldingPassPass(*PassRegistry::getPassRegistry());
-  }
+  X86CondBrFoldingPass() : MachineFunctionPass(ID) { }
   StringRef getPassName() const override { return "X86 CondBr Folding"; }
 
   bool runOnMachineFunction(MachineFunction &MF) override;