[lld] [LLD][ELF]Skip non-inputsections to avoid invalid cast in Arm BE8 handling. (PR #188154)

[Peter Smith via llvm-commits]

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+// REQUIRES: arm
+// Ensure that ARM big-endian(BE8) can link SHF_MERGE sections with mapping symbols correctly.
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smithp35 wrote:

Non filecheck comment starts with ///

https://github.com/llvm/llvm-project/pull/188154