Delete unused method in lir::Rewrite

Summary: Title says it all.

Reviewed By: mpage

Differential Revision: D81721577

fbshipit-source-id: 1dbeeb2c4446b1908883093b5f7a85361bf16c08

Author: alexmalyshev

cinderx/Jit/lir/rewrite.cpp

@@ -67,25 +67,4 @@ void Rewrite::runOneStage(int stage) {
   } while (changed);
 }
 
-Instruction* Rewrite::findRecentFlagAffectingInstr(instr_iter_t instr_iter) {
-  Instruction* condbranch = instr_iter->get();
-  JIT_CHECK(
-      condbranch->isCondBranch(), "Input must be a CondBranch instruction.");
-
-  BasicBlock* block = condbranch->basicblock();
-  while (instr_iter != block->instructions().begin()) {
-    --instr_iter;
-    Instruction* instr = instr_iter->get();
-    switch (InstrProperty::getProperties(instr).flag_effects) {
-      case FlagEffects::kInvalidate:
-        return nullptr;
-      case FlagEffects::kSet:
-        return instr;
-      case FlagEffects::kNone:
-        continue;
-    }
-  }
-  return nullptr;
-}
-
 } // namespace jit::lir

cinderx/Jit/lir/rewrite.h

@@ -92,11 +92,6 @@ class Rewrite {
 
   void run();
 
- protected:
-  // find the most recent instruction affecting flags within the
-  // basic block. returns nullptr if not found.
-  static Instruction* findRecentFlagAffectingInstr(instr_iter_t instr_iter);
-
  private:
   template <typename T>
   std::pair<bool, const T*> getStageRewrites(