riscv64 is missing lldb

[kasper]

llvm-toolchian-18 riscv64 has recently enabled lldb support upstream: https://salsa.debian.org/pkg-llvm-team/llvm-toolchain/-/commit/4cf15e6671

please enable it in ubuntu as well. SRU (https://wiki.ubuntu.com/StableReleaseUpdates) for this on 24.04 would be nice since it is a new official arch and without the llvm debugger, we can't use lldb plugins (gdb has a completely different plugin interface so it's pretty much a no-go).

[kasper (kasperk81)]

lldb debugger is available in debian:unstable

```
docker run --rm --platform linux/riscv64 debian:unstable sh -c \
  'apt update && apt search liblldb-18-dev'
...
liblldb-18-dev/unstable 1:18.1.8-2 riscv64
```

[Łukasz Zemczak (sil2100)]

Hello kasper, or anyone else affected,

Accepted llvm-toolchain-18 into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/llvm-toolchain-18/1:18.1.8-9ubuntu1~24.04 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted llvm-toolchain-18 (1:18.1.8-9ubuntu1~24.04) for noble have finished running.
The following regressions have been reported in tests triggered by the package:

bpftrace/0.20.2-1ubuntu4 (amd64)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/noble/update_excuses.html#llvm-toolchain-18

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!