[DebugInfo] Use shrink_to_fit to simplify code. NFCI.

llvm-svn: 309683

2 files changed, 4 insertions, 14 deletions

diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDebugAranges.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugAranges.cpp
index 65c486a6cf3..a3ecb15e366 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugAranges.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugAranges.cpp
@@ -107,8 +107,8 @@ void DWARFDebugAranges::construct() {
   assert(ValidCUs.empty());
 
   // Endpoints are not needed now.
-  std::vector<RangeEndpoint> EmptyEndpoints;
-  EmptyEndpoints.swap(Endpoints);
+  Endpoints.clear();
+  Endpoints.shrink_to_fit();
 }
 
 uint32_t DWARFDebugAranges::findAddress(uint64_t Address) const {
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp b/llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
index f55ece2fdfd..0a12fb2ecaa 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
@@ -307,18 +307,8 @@ bool DWARFUnit::parseDWO() {
 
 void DWARFUnit::clearDIEs(bool KeepCUDie) {
   if (DieArray.size() > (unsigned)KeepCUDie) {
-    // std::vectors never get any smaller when resized to a smaller size,
-    // or when clear() or erase() are called, the size will report that it
-    // is smaller, but the memory allocated remains intact (call capacity()
-    // to see this). So we need to create a temporary vector and swap the
-    // contents which will cause just the internal pointers to be swapped
-    // so that when temporary vector goes out of scope, it will destroy the
-    // contents.
-    std::vector<DWARFDebugInfoEntry> TmpArray;
-    DieArray.swap(TmpArray);
-    // Save at least the compile unit DIE
-    if (KeepCUDie)
-      DieArray.push_back(TmpArray.front());
+    DieArray.resize((unsigned)KeepCUDie);
+    DieArray.shrink_to_fit();
   }
 }