r240530 - Remove a limited and somewhat questionable DenseMapInfo specialization

[Chandler Carruth]

Author: chandlerc
Date: Wed Jun 24 05:24:30 2015
New Revision: 240530

URL: http://llvm.org/viewvc/llvm-project?rev=240530&view=rev
Log:
Remove a limited and somewhat questionable DenseMapInfo specialization
for StringRef now that the core DenseMap library provides this facility.

Modified:
    cfe/trunk/lib/Basic/VirtualFileSystem.cpp

Modified: cfe/trunk/lib/Basic/VirtualFileSystem.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/VirtualFileSystem.cpp?rev=240530&r1=240529&r2=240530&view=diff
==============================================================================
--- cfe/trunk/lib/Basic/VirtualFileSystem.cpp (original)
+++ cfe/trunk/lib/Basic/VirtualFileSystem.cpp Wed Jun 24 05:24:30 2015
@@ -324,20 +324,6 @@ directory_iterator OverlayFileSystem::di
 // VFSFromYAML implementation
 //===-----------------------------------------------------------------------===/
 
-// Allow DenseMap<StringRef, ...>.  This is useful below because we know all the
-// strings are literals and will outlive the map, and there is no reason to
-// store them.
-namespace llvm {
-  template<>
-  struct DenseMapInfo<StringRef> {
-    // This assumes that "" will never be a valid key.
-    static inline StringRef getEmptyKey() { return StringRef(""); }
-    static inline StringRef getTombstoneKey() { return StringRef(); }
-    static unsigned getHashValue(StringRef Val) { return HashString(Val); }
-    static bool isEqual(StringRef LHS, StringRef RHS) { return LHS == RHS; }
-  };
-}
-
 namespace {
 
 enum EntryKind {