fix: fix shadowstack pass discard debuginfo

[HerrCai0907]

In shadowstack pass, if some function need to add temp local, It need to be removed and re-added. It will discard all debug info because debug info bind with functionref.

This PR aims at re-assign the debug info after shadowstack pass

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[dcodeIO]

Would it perhaps be preferable to add a replaceFunction(..., preserveDebugInfo = true) helper of sorts that can be called instead of removing the function and adding a new one? I guess then we'd not need to remember intermediate state.

[MaxGraey]

Yeah, also prefer to update updateFunction(funcRef: FunctionRef) to updateFunction(funcRef: FunctionRef, preserveDebugInfo: bool)

or simply check this.options.debugInfo inside updateFunction

[HerrCai0907]

Would it perhaps be preferable to add a replaceFunction(..., preserveDebugInfo = true) helper of sorts that can be called instead of removing the function and adding a new one? I guess then we'd not need to remember intermediate state.

You mean add this API in binaryen? I also agree it is more eleganta