Fix debug info support

[koute]

It seems like debug info is completely broken on the newest toolchain; the test_basic_debug_info_32 and test_basic_debug_info_64 tests we have fail here:

    assert_eq!(frame.line(), Some(line as u32 + 1));
    assert_eq!(frame.full_name().unwrap().to_string(), "read_u32");

The line is wrong, and the strings in the debug info are all "cap" for some reason.

[koute]

@jarkkojs You can try tackling this once you finish updating PolkaVM in polkadot-sdk.

[jarkkojs]

@jarkkojs You can try tackling this once you finish updating PolkaVM in polkadot-sdk.

+1