[llvm] Rename GsymDIContext to GsymContext (PR #140227)

[via llvm-commits]

dyung wrote:

> LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu-no-asserts` running on `doug-worker-6` while building `llvm` at step 6 "test-build-unified-tree-check-all".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/202/builds/1270
> 
> Here is the relevant piece of the build log for the reference

This is one of my bots, and the test `op-convert-offset.test` seems to be intermittently failing ever since this commit I'm guessing? Can you take a look?

https://github.com/llvm/llvm-project/pull/140227