[lldb] Replace deprecated std::unique_ptr::unique() to silence a warning with MS-STL. NFC.

MS-STL warns about this with `warning STL4016: std::shared_ptr::unique() is deprecated in C++17`.

Author: aganea

lldb/source/API/SBTypeFilter.cpp

@@ -166,7 +166,7 @@ SBTypeFilter::SBTypeFilter(const lldb::TypeFilterImplSP &typefilter_impl_sp)
 bool SBTypeFilter::CopyOnWrite_Impl() {
   if (!IsValid())
     return false;
-  if (m_opaque_sp.unique())
+  if (m_opaque_sp.use_count() == 1)
     return true;
 
   TypeFilterImplSP new_sp(new TypeFilterImpl(GetOptions()));

lldb/source/API/SBTypeFormat.cpp

@@ -157,7 +157,7 @@ bool SBTypeFormat::CopyOnWrite_Impl(Type type) {
   if (!IsValid())
     return false;
 
-  if (m_opaque_sp.unique() &&
+  if (m_opaque_sp.use_count() == 1 &&
       ((type == Type::eTypeKeepSame) ||
        (type == Type::eTypeFormat &&
         m_opaque_sp->GetType() == TypeFormatImpl::Type::eTypeFormat) ||

lldb/source/API/SBTypeSummary.cpp

@@ -381,7 +381,7 @@ bool SBTypeSummary::CopyOnWrite_Impl() {
   if (!IsValid())
     return false;
 
-  if (m_opaque_sp.unique())
+  if (m_opaque_sp.use_count() == 1)
     return true;
 
   TypeSummaryImplSP new_sp;

lldb/source/API/SBTypeSynthetic.cpp

@@ -184,7 +184,7 @@ SBTypeSynthetic::SBTypeSynthetic(
 bool SBTypeSynthetic::CopyOnWrite_Impl() {
   if (!IsValid())
     return false;
-  if (m_opaque_sp.unique())
+  if (m_opaque_sp.use_count() == 1)
     return true;
 
   ScriptedSyntheticChildrenSP new_sp(new ScriptedSyntheticChildren(

lldb/source/Core/ModuleList.cpp

@@ -346,7 +346,7 @@ bool ModuleList::RemoveIfOrphaned(const Module *module_ptr) {
     collection::iterator pos, end = m_modules.end();
     for (pos = m_modules.begin(); pos != end; ++pos) {
       if (pos->get() == module_ptr) {
-        if (pos->unique()) {
+        if (pos->use_count() == 1) {
           pos = RemoveImpl(pos);
           return true;
         } else
@@ -377,7 +377,7 @@ size_t ModuleList::RemoveOrphans(bool mandatory) {
     made_progress = false;
     collection::iterator pos = m_modules.begin();
     while (pos != m_modules.end()) {
-      if (pos->unique()) {
+      if (pos->use_count() == 1) {
         pos = RemoveImpl(pos);
         ++remove_count;
         // We did make progress.