[clang] [clang][bytecode] Avoid crash in constexpr wcslen on invalid argument… (PR #177891)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/AST/ByteCode/InterpBuiltin.cpp clang/test/AST/ByteCode/builtin-functions.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/ByteCode/InterpBuiltin.cpp b/clang/lib/AST/ByteCode/InterpBuiltin.cpp
index 100efe0d4..4cf6898df 100644
--- a/clang/lib/AST/ByteCode/InterpBuiltin.cpp
+++ b/clang/lib/AST/ByteCode/InterpBuiltin.cpp
@@ -373,7 +373,6 @@ static bool interp__builtin_strlen(InterpState &S, CodePtr OpPC,
       return false;
   }
 
-
   size_t Len = 0;
   for (size_t I = StrPtr.getIndex();; ++I, ++Len) {
     const Pointer &ElemPtr = StrPtr.atIndex(I);

``````````

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https://github.com/llvm/llvm-project/pull/177891