Update LLVM lib/Demangle from r371469 to r372602

New:
  - [ms] demangle rtti descriptor names

Ran:

  cp ~/src/llvm-project/llvm/include/llvm/Demangle/*.h third_party/llvm/include/llvm/Demangle/
  cp ~/src/llvm-project/llvm/lib/Demangle/*.cpp third_party/llvm/lib/Demangle/
  cp ~/src/llvm-project/llvm/LICENSE.TXT third_party/llvm/LICENSE.txt

Related to #9.

demumble_test.py

@@ -39,6 +39,7 @@
     ('demumble -bx < bar', re.compile(".*unrecognized option `x' in `-bx'.*")),
     ('demumble < _ZZ3fooiENK3$_0clEi',
      'foo(int)::$_0::operator()(int) const\n'),
+    ('demumble .?AVNet@@', "class Net `RTTI Type Descriptor Name'\n"),
 ]
 
 status = 0

third_party/llvm/include/llvm/Demangle/MicrosoftDemangle.h

@@ -158,6 +158,7 @@ class Demangler {
                                     QualifiedNameNode *QN);
   SymbolNode *demangleDeclarator(StringView &MangledName);
   SymbolNode *demangleMD5Name(StringView &MangledName);
+  SymbolNode *demangleTypeinfoName(StringView &MangledName);
 
   VariableSymbolNode *demangleVariableEncoding(StringView &MangledName,
                                                StorageClass SC);

third_party/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h

@@ -303,8 +303,6 @@ struct TypeNode : public Node {
     outputPost(OS, Flags);
   }
 
-  void outputQuals(bool SpaceBefore, bool SpaceAfter) const;
-
   Qualifiers Quals = Q_None;
 };
 

third_party/llvm/lib/Demangle/MicrosoftDemangle.cpp

@@ -783,8 +783,26 @@ SymbolNode *Demangler::demangleMD5Name(StringView &MangledName) {
   return S;
 }
 
+SymbolNode *Demangler::demangleTypeinfoName(StringView &MangledName) {
+  assert(MangledName.startsWith('.'));
+  MangledName.consumeFront('.');
+
+  TypeNode *T = demangleType(MangledName, QualifierMangleMode::Result);
+  if (Error || !MangledName.empty()) {
+    Error = true;
+    return nullptr;
+  }
+  return synthesizeVariable(Arena, T, "`RTTI Type Descriptor Name'");
+}
+
 // Parser entry point.
 SymbolNode *Demangler::parse(StringView &MangledName) {
+  // Typeinfo names are strings stored in RTTI data. They're not symbol names.
+  // It's still useful to demangle them. They're the only demangled entity
+  // that doesn't start with a "?" but a ".".
+  if (MangledName.startsWith('.'))
+    return demangleTypeinfoName(MangledName);
+
   if (MangledName.startsWith("??@"))
     return demangleMD5Name(MangledName);
 

third_party/llvm/lib/Demangle/MicrosoftDemangleNodes.cpp

@@ -120,8 +120,6 @@ std::string Node::toString(OutputFlags Flags) const {
   return {OS.getBuffer()};
 }
 
-void TypeNode::outputQuals(bool SpaceBefore, bool SpaceAfter) const {}
-
 void PrimitiveTypeNode::outputPre(OutputStream &OS, OutputFlags Flags) const {
   switch (PrimKind) {
     OUTPUT_ENUM_CLASS_VALUE(PrimitiveKind, Void, "void");