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cranelift-fuzzgen fuzzbug: "index out of bounds: the len is 2 but the index is 2" #4757

@cfallin

Description

@cfallin

From oss-fuzz (https://oss-fuzz.com/testcase-detail/4548183442718720).

thread '<unnamed>' panicked at 'index out of bounds: the len is 2 but the index is 2', [wasmtime/cranelift/module/src/module.rs:384](https://github.com/bytecodealliance/wasmtime/blob/d620705a323e3da59bd90473b4e627c8502b1255/cranelift/module/src/module.rs#L384):10

with input (base64'd):
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=

cc @afonso360

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