Backport `.init_array` WebAssembly fixes to release/19.x

[georgestagg]

I'd like to backport #111008 & #119127, implementing fixes for when there are multiple .init_array sections in WebAssembly.

/cherry-pick ac5dd45 ed91843

[llvmbot]

I'd like to backport #111008 & #119127, implementing fixes for when there are multiple .init_array sections in WebAssembly.

/cherry-pick ac5dd45 ed91843

Error: Command failed due to missing milestone.

[georgestagg]

I don't seem to have permission to add the Release 19.x milestone. If someone could tag the issue for me I'd appreciate it.

[nikic]

/cherry-pick ac5dd45 ed91843

[llvmbot]

/pull-request #119533

[llvmbot]

@llvm/issue-subscribers-backend-webassembly

Author: George Stagg (georgestagg)

I'd like to backport #111008 & #119127, implementing fixes for when there are multiple `.init_array` sections in WebAssembly.

/cherry-pick ac5dd45 ed91843