[clang] [Driver] Treat -O4 as -O3 in clang::getOptimizationLevel, which is called when building LTO link command (PR #216450)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/lib/Frontend/CompilerInvocation.cpp clang/test/Driver/lto.c --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 8a72e3c38..3aadb4107 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -2726,7 +2726,8 @@ unsigned clang::getOptimizationLevel(const ArgList &Args, InputKind IK,
     if (A->getOption().matches(options::OPT_O0))
       return 0;
 
-    if (A->getOption().matches(options::OPT_Ofast) || A->getOption().matches(options::OPT_O4))
+    if (A->getOption().matches(options::OPT_Ofast) ||
+        A->getOption().matches(options::OPT_O4))
       return 3;
 
     assert(A->getOption().matches(options::OPT_O));

``````````

</details>


https://github.com/llvm/llvm-project/pull/216450