[llvm] [Object][Wasm] Guard relocation diagnostics against out-of-range indexes (PR #204872)

[KIM SO JUNG via llvm-commits]

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sjg-388 wrote:

Moved the test to llvm/test/Object/Wasm/bad-relocation.yaml as suggested.
The new test case adds a second YAML document with an out-of-range relocation
index (13) to the existing file, which already covers the in-bounds type
mismatch case.

Also removed llvm/test/tools/llvm-readobj/wasm/invalid-reloc-symbol-index.test
as it is superseded by the updated bad-relocation.yaml.

https://github.com/llvm/llvm-project/pull/204872