Remove unneeded assertion.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60559 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index 85d009b..9609930 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -244,7 +244,7 @@
 PTHManager::~PTHManager() {
   delete Buf;
   delete (PTHFileLookup*) FileLookup;
-  assert(PerIDCache); free(PerIDCache);
+  free(PerIDCache);
 }
 
 PTHManager* PTHManager::Create(const std::string& file, Preprocessor& PP) {