[clang] [HLSL] Implement the `lit` intrinsic (PR #134171)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h -- clang/lib/Headers/hlsl.h clang/lib/Headers/hlsl/hlsl_compat_overloads.h clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h clang/lib/Headers/hlsl/hlsl_intrinsics.h
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h b/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
index c3e5b105f..3a41635a8 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
@@ -105,7 +105,7 @@ template <typename T> constexpr vector<T, 4> lit_impl(T NDotL, T NDotH, T M) {
   bool DiffuseCond = NDotL < 0;
   T Diffuse = select<T>(DiffuseCond, 0, NDotL);
   vector<T, 4> Result = {1, Diffuse, 0, 1};
-  bool SpecularCond = or(DiffuseCond, (NDotH < 0));
+  bool SpecularCond = or (DiffuseCond, (NDotH < 0));
   T SpecularExp = exp(log(NDotH) * M);
   Result[2] = select<T>(SpecularCond, 0, SpecularExp);
   return Result;

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https://github.com/llvm/llvm-project/pull/134171