[clang-tools-extra] feat: highlight for import, export keyword of CXX Module (PR #204511)

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@@ -1123,6 +1123,18 @@ sizeof...($TemplateParameter[[Elements]]);
   )cpp"}},
                      ~ScopeModifierMask);
 
+  checkHighlightings(R"cpp(
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Decodetalkers wrote:

I have tried to add import std;

TestTU failed to build (suppress with /*error-ok*/):
[2:13-2:17] module 'std' not found

For code:

      module;
      import std;
      export module highlight;
      export void foo() {
      }
       #0 0x00005559b2ed0892 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) 
       
std not found



https://github.com/llvm/llvm-project/pull/204511