[clang] [HLSL] Implement the `ldexp` intrinsic (PR #138182)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions 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_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index ffeb09bb4..b26ebbcbe 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -308,7 +308,8 @@ fmod(__detail::HLSL_FIXED_VECTOR<float, N> X,
 //===----------------------------------------------------------------------===//
 
 /// \fn T ldexp(T X, T Exp)
-/// \brief Returns the result of multiplying \a X by two, raised to the power of \a Exp.
+/// \brief Returns the result of multiplying \a X by two, raised to the power of
+/// \a Exp.
 /// \param X [in] The specified value.
 /// \param Exp [in] The specified exponent.
 ///

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https://github.com/llvm/llvm-project/pull/138182