Remove the now-unused NonErrorHandlingBlocks

Author: DougGregor

include/swift/SILOptimizer/Utils/BasicBlockOptUtils.h

@@ -69,20 +69,6 @@ class ReachingReturnBlocks {
   }
 };
 
-/// Computes the set of blocks which are not used for error handling, i.e. not
-/// (exclusively) reachable from the error-block of a try_apply.
-class NonErrorHandlingBlocks {
-    BasicBlockWorklist worklist;
-
-public:
-  NonErrorHandlingBlocks(SILFunction *function);
-
-  /// Returns true if there exists a path from \p block to the return-block.
-  bool isNonErrorHandling(SILBasicBlock *block) const {
-    return worklist.isVisited(block);
-  }
-};
-
 /// Remove all unreachable blocks in a function.
 bool removeUnreachableBlocks(SILFunction &f);
 

lib/SILOptimizer/Mandatory/PerformanceDiagnostics.cpp

@@ -213,8 +213,6 @@ bool PerformanceDiagnostics::visitFunctionEmbeddedSwift(
     return false;
   visitedFuncs[function] = PerformanceConstraints::None;
 
-  NonErrorHandlingBlocks neBlocks(function);
-
   for (SILBasicBlock &block : *function) {
     for (SILInstruction &inst : block) {
       if (visitInst(&inst, PerformanceConstraints::None, parentLoc)) {
@@ -283,8 +281,6 @@ bool PerformanceDiagnostics::visitFunction(SILFunction *function,
   if (!function->isDefinition())
     return false;
 
-  NonErrorHandlingBlocks neBlocks(function);
-
   for (SILBasicBlock &block : *function) {
     // Exclude fatal-error blocks.
     if (isa<UnreachableInst>(block.getTerminator()))

lib/SILOptimizer/Utils/BasicBlockOptUtils.cpp

@@ -55,19 +55,6 @@ ReachingReturnBlocks::ReachingReturnBlocks(SILFunction *function)
   }
 }
 
-NonErrorHandlingBlocks::NonErrorHandlingBlocks(SILFunction *function)
-    : worklist(function->getEntryBlock()) {
-  while (SILBasicBlock *block = worklist.pop()) {
-    if (auto ta = dyn_cast<TryApplyInst>(block->getTerminator())) {
-      worklist.pushIfNotVisited(ta->getNormalBB());
-    } else {
-      for (SILBasicBlock *succ : block->getSuccessorBlocks()) {
-        worklist.pushIfNotVisited(succ);
-      }
-    }
-  }
-}
-
 bool swift::removeUnreachableBlocks(SILFunction &f) {
   ReachableBlocks reachable(&f);
   // Visit all the blocks without doing any extra work.