Visual Studio visualizers associated with LookupResults

Visualizers for DeclAccessPair, UnresolvedSet, and LookupResult. For example,
when combined with LLVM diff D21256 (currently in review), a Lookup set will
show much more naturally in the Locals window something like

  Found: {public typename ...Ts}

llvm-svn: 272448

1 files changed, 18 insertions, 0 deletions

diff --git a/clang/utils/ClangVisualizers/clang.natvis b/clang/utils/ClangVisualizers/clang.natvis
index 72ecc6a4b23..62cea41950a 100644
--- a/clang/utils/ClangVisualizers/clang.natvis
+++ b/clang/utils/ClangVisualizers/clang.natvis
@@ -481,4 +481,22 @@ For later versions of Visual Studio, no setup is required-->
   <Type Name="clang::Expr">

     <DisplayString>Expression of class {(clang::Stmt::StmtClass)StmtBits.sClass,en} and type {TR,view(cpp)}</DisplayString>

   </Type>

+  <Type Name="clang::DeclAccessPair">

+    <DisplayString IncludeView="access" Condition="(Ptr&amp;Mask) == clang::AS_public">public</DisplayString>

+    <DisplayString IncludeView="access" Condition="(Ptr&amp;Mask) == clang::AS_protected">protected</DisplayString>

+    <DisplayString IncludeView="access" Condition="(Ptr&amp;Mask) == clang::AS_private">private</DisplayString>

+    <DisplayString IncludeView="access" Condition="(Ptr&amp;Mask) == clang::AS_none">b</DisplayString>

+    <DisplayString IncludeView="decl">{*(clang::NamedDecl *)(Ptr&amp;~Mask)}</DisplayString>

+    <DisplayString>{*this,view(access)} {*this,view(decl)}</DisplayString>

+  </Type>

+  <Type Name="clang::UnresolvedSet&lt;*&gt;">

+    <DisplayString>{Decls}</DisplayString>

+    <Expand>

+      <ExpandedItem>Decls</ExpandedItem>

+    </Expand>

+  </Type>

+  <Type Name="clang::LookupResult">

+    <DisplayString Condition="ResultKind == clang::LookupResult::Ambiguous">{Ambiguity,en}: {Decls}</DisplayString>

+    <DisplayString>{ResultKind,en}: {Decls}</DisplayString>

+  </Type>

 </AutoVisualizer>