[PrunedLiveness] Removed invalidate.

The method doesn't do what clients expect.

Author: nate-chandler

include/swift/SIL/PrunedLiveness.h

@@ -202,10 +202,6 @@ class PrunedLiveBlocks {
 
   bool isInitialized() const { return initializedFlag; }
 
-  void invalidate() {
-    initializedFlag = false;
-  }
-
   void initializeDiscoveredBlocks(
       SmallVectorImpl<SILBasicBlock *> *discoveredBlocks) {
     assert(!isInitialized() && "cannot reinitialize after blocks are live");
@@ -371,11 +367,6 @@ class PrunedLiveness {
 
   bool empty() const { return users.empty(); }
 
-  void invalidate() {
-    liveBlocks.invalidate();
-    users.clear();
-  }
-
   void initializeDiscoveredBlocks(
       SmallVectorImpl<SILBasicBlock *> *discoveredBlocks) {
     liveBlocks.initializeDiscoveredBlocks(discoveredBlocks);
@@ -639,12 +630,6 @@ class SSAPrunedLiveness : public PrunedLiveRange<SSAPrunedLiveness> {
 
   SILValue getDef() const { return def; }
 
-  void invalidate() {
-    def = SILValue();
-    defInst = nullptr;
-    PrunedLiveRange::invalidate();
-  }
-
   void initializeDef(SILValue def) {
     assert(!this->def && "reinitialization");
 
@@ -710,10 +695,6 @@ class MultiDefPrunedLiveness : public PrunedLiveRange<MultiDefPrunedLiveness> {
       : PrunedLiveRange(function, discoveredBlocks), defs(function),
         defBlocks(function) {}
 
-  void invalidate() {
-    PrunedLiveRange::invalidate();
-  }
-
   void initializeDef(SILInstruction *defInst) {
     initializeDefNode(cast<SILNode>(defInst));
   }
@@ -800,12 +781,6 @@ class DiagnosticPrunedLiveness : public SSAPrunedLiveness {
       : SSAPrunedLiveness(function, discoveredBlocks),
         nonLifetimeEndingUsesInLiveOut(nonLifetimeEndingUsesInLiveOut) {}
 
-  void invalidate() {
-    SSAPrunedLiveness::invalidate();
-    if (nonLifetimeEndingUsesInLiveOut)
-      nonLifetimeEndingUsesInLiveOut->clear();
-  }
-
   void updateForUse(SILInstruction *user, bool lifetimeEnding);
 
   using NonLifetimeEndingUsesInLiveOutRange =

include/swift/SILOptimizer/Utils/OwnershipOptUtils.h

@@ -115,13 +115,6 @@ class GuaranteedOwnershipExtension {
     : deleter(deleter), deBlocks(deBlocks),
       guaranteedLiveness(function), ownedLifetime(function) {}
 
-  void invalidate() {
-    guaranteedLiveness.invalidate();
-    ownedLifetime.invalidate();
-    ownedConsumeBlocks.clear();
-    beginBorrow = nullptr;
-  }
-
   /// Invalid indicates that the current guaranteed scope is insufficient, and
   /// it does not meet the precondition for scope extension.
   ///