[lld] [lld-macho]Define a flag for adjusting slop scale (PR #164295)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- lld/MachO/ConcatOutputSection.cpp lld/MachO/Config.h lld/MachO/Driver.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
index aa6d36755..17f3d097d 100644
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -2000,8 +2000,7 @@ bool link(ArrayRef<const char *> argsArr, llvm::raw_ostream &stdoutOS,
     unsigned slop = 0;
     if (!llvm::to_integer(v, slop))
       error(arg->getSpelling() +
-            ": expected a non-negative integer, but got '" + v +
-            "'");
+            ": expected a non-negative integer, but got '" + v + "'");
     config->slopScale = slop;
   }
 

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https://github.com/llvm/llvm-project/pull/164295