message: Fix up lldb after clang r360311.
  Patch by Tyker!
diff: @@ -8173,6 +8173,10 @@ clang::CXXMethodDecl *ClangASTContext::AddMethodToCXXRecordType(
  if (is_artificial)
  return nullptr; // skip everything artificial
  + const clang::ExplicitSpecifier explicit_spec(
  + nullptr /*expr*/, is_explicit
  + ? clang::ExplicitSpecKind::ResolvedTrue
  + : clang::ExplicitSpecKind::ResolvedFalse);
  if (name[0] == '~') {
  cxx_dtor_decl = clang::CXXDestructorDecl::Create(
  *getASTContext(), cxx_record_decl, clang::SourceLocation(),
  @@ -8191,7 +8195,7 @@ clang::CXXMethodDecl *ClangASTContext::AddMethodToCXXRecordType(
  clang::SourceLocation()),
  method_qual_type,
  nullptr, // TypeSourceInfo *
  - is_explicit, is_inline, is_artificial, false /*is_constexpr*/);
  + explicit_spec, is_inline, is_artificial, false /*is_constexpr*/);
  cxx_method_decl = cxx_ctor_decl;
  } else {
  clang::StorageClass SC = is_static ? clang::SC_Static : clang::SC_None;
  @@ -8226,7 +8230,7 @@ clang::CXXMethodDecl *ClangASTContext::AddMethodToCXXRecordType(
  clang::SourceLocation()),
  method_qual_type,
  nullptr, // TypeSourceInfo *
  - is_inline, is_explicit, false /*is_constexpr*/,
  + is_inline, explicit_spec, false /*is_constexpr*/,
  clang::SourceLocation());
  }
  }
  