[clang][IFS] Adds support for more decl types in clang interface stubs.
Adding support for processing the following Decls: NonTypeTemplateParmDecl,
CXXConversionDecl, UnresolvedUsingValueDecl, UsingDecl, UsingShadowDecl,
TypeAliasTemplateDecl, TypeAliasDecl, VarTemplateDecl,
VarTemplateSpecializationDecl, UsingDirectiveDecl, TemplateTemplateParmDecl,
ClassTemplatePartialSpecializationDecl, IndirectFieldDecl.
Also, this allows for processing NamedDecls that don't have an identifier and
skips over VarDecls that are dependent on template types.
Differential Revision: https://reviews.llvm.org/D69995
diff --git a/clang/test/InterfaceStubs/template-constexpr.cpp b/clang/test/InterfaceStubs/template-constexpr.cpp
new file mode 100644
index 0000000..770a307
--- /dev/null
+++ b/clang/test/InterfaceStubs/template-constexpr.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang -c -o - -emit-interface-stubs %s | FileCheck %s
+
+// CHECK: --- !experimental-ifs-v1
+// CHECK-NEXT: IfsVersion: 1.0
+// CHECK-NEXT: Triple: x86_64-unknown-linux-gnu
+// CHECK-NEXT: ObjectFileFormat: ELF
+// CHECK-NEXT: Symbols:
+// CHECK-NEXT: ...
+
+template<typename T, T v> struct S8 { static constexpr T value = v; };
+template<typename T, T v> constexpr T S8<T, v>::value;
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