Remove uses of the redundant ".reset(nullptr)" of unique_ptr, in favor of ".reset()"

It's also possible to just write "= nullptr", but there's some question
of whether that's as readable, so I leave it up to authors to pick which
they prefer for now. If we want to discuss standardizing on one or the
other, we can do that at some point in the future.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213438 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/IPA/CallGraph.cpp

@@ -267,7 +267,7 @@ INITIALIZE_PASS(CallGraphWrapperPass, "basiccg", "CallGraph Construction",
 
 char CallGraphWrapperPass::ID = 0;
 
-void CallGraphWrapperPass::releaseMemory() { G.reset(nullptr); }
+void CallGraphWrapperPass::releaseMemory() { G.reset(); }
 
 void CallGraphWrapperPass::print(raw_ostream &OS, const Module *) const {
   if (!G) {

lib/CodeGen/RegAllocBasic.cpp

@@ -157,7 +157,7 @@ void RABasic::getAnalysisUsage(AnalysisUsage &AU) const {
 }
 
 void RABasic::releaseMemory() {
-  SpillerInstance.reset(nullptr);
+  SpillerInstance.reset();
 }
 
 

lib/CodeGen/RegAllocGreedy.cpp

@@ -486,7 +486,7 @@ void RAGreedy::LRE_DidCloneVirtReg(unsigned New, unsigned Old) {
 }
 
 void RAGreedy::releaseMemory() {
-  SpillerInstance.reset(nullptr);
+  SpillerInstance.reset();
   ExtraRegInfo.clear();
   GlobalCand.clear();
 }

lib/Support/FileOutputBuffer.cpp

@@ -87,7 +87,7 @@ FileOutputBuffer::create(StringRef FilePath, size_t Size,
 
 std::error_code FileOutputBuffer::commit(int64_t NewSmallerSize) {
   // Unmap buffer, letting OS flush dirty pages to file on disk.
-  Region.reset(nullptr);
+  Region.reset();
 
   // If requested, resize file as part of commit.
   if ( NewSmallerSize != -1 ) {

utils/TableGen/DAGISelMatcherOpt.cpp

@@ -400,7 +400,7 @@ static void FactorNodes(std::unique_ptr<Matcher> &MatcherPtr) {
   }
   
   if (NewOptionsToMatch.empty()) {
-    MatcherPtr.reset(nullptr);
+    MatcherPtr.reset();
     return;
   }