[llvm] Introduce LDBG_OS() macro as a variant of LDBG() (PR #157194)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/Support/Debug.h llvm/include/llvm/Support/DebugLog.h llvm/unittests/Support/DebugLogTest.cpp
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``````````diff
diff --git a/llvm/include/llvm/Support/DebugLog.h b/llvm/include/llvm/Support/DebugLog.h
index 3f90ba952..5d3e94295 100644
--- a/llvm/include/llvm/Support/DebugLog.h
+++ b/llvm/include/llvm/Support/DebugLog.h
@@ -109,7 +109,7 @@ namespace llvm {
 /// defined. They use a combination of preprocessor tricks and C++11
 /// user-defined string literals to achieve this.
 /// For example, if DEBUG_TYPE is defined to "foo", the preprocessor will expand
-/// the macro and then stringify the result to: 
+/// the macro and then stringify the result to:
 ///   * "foo"_LDBG_VARIABLE_CHECK
 /// This dispatches to the user-defined string literal operator named
 /// _LDBG_VARIABLE_CHECK which returns true. Otherwise it expands to
@@ -151,9 +151,9 @@ constexpr ::llvm::StringRef operator""_LDBG_DEBUG_STRING(const char *Str,
 }
 
 /// Helper to provide the default level (=1) or type (=DEBUG_TYPE). This is used
-/// when a single argument is passed to LDBG() (or LDBG_OS()), if it is an integer we return DEBUG_TYPE
-/// and if it is a string we return 1. This fails with a static_assert if we
-/// pass an integer and DEBUG_TYPE is not defined.
+/// when a single argument is passed to LDBG() (or LDBG_OS()), if it is an
+/// integer we return DEBUG_TYPE and if it is a string we return 1. This fails
+/// with a static_assert if we pass an integer and DEBUG_TYPE is not defined.
 #define LDBG_GET_DEFAULT_TYPE_OR_LEVEL(LEVEL_OR_TYPE)                          \
   [](auto LevelOrType) {                                                       \
     if constexpr (std::is_integral_v<decltype(LevelOrType)>) {                 \

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https://github.com/llvm/llvm-project/pull/157194