[llvm] [docs] Document which online sync-ups are no longer happening (PR #89361)

[Michal Paszkowski via llvm-commits]

================
@@ -214,23 +196,57 @@ what to add to your calendar invite.
      - 1st and 3rd Wednesday of the month
      - `gcal <https://calendar.google.com/calendar/u/0?cid=cW1lZGg0ZXNpMnIyZDN2aTVydGVrdWF1YzRAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ>`__
      - `Minutes/docs <https://docs.google.com/document/d/1x5-RbOC6-jnI_NcJ9Dp4pSmGhhNe7lUevuWUIB46TeM/edit?usp=sharing>`__
-   * - LLVM SPIR-V Backend Working Group
-     - Every week on Monday
-     -
-     - `Meeting details/agenda <https://docs.google.com/document/d/1UjX-LAwPjJ75Nmb8a5jz-Qrm-pPtKtQw0k1S1Lop9jU/edit?usp=sharing>`__
    * - SYCL Upstream Working Group
      - Every 2 weeks on Mondays
      - `gcal <https://calendar.google.com/calendar/u/0?cid=c3ljbC5sbHZtLndnQGdtYWlsLmNvbQ>`__
      - `Meeting details/agenda <https://docs.google.com/document/d/1ivYDSn_5ChTeiZ7TiO64WC_jYJnGwAUiT9Ngi9cAdFU/edit?usp=sharing>`__
-   * - GlobalISel
-     - Every 2nd Tuesday of the month
-     - `gcal <https://calendar.google.com/calendar/u/0?cid=ZDcyMjc0ZjZiZjNhMzFlYmE3NTNkMWM2MGM2NjM5ZWU3ZDE2MjM4MGFlZDc2ZjViY2UyYzMwNzVhZjk4MzQ4ZEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t>`__
-     - `Meeting details/agenda <https://docs.google.com/document/d/1Ry8O4-Tm5BFj9AMjr8qTQFU80z-ptiNQ62687NaIvLs/edit?usp=sharing>`__
    * - Floating Point Working Group
      - Every 3rd Wednesday of the month
      - `gcal <https://calendar.google.com/calendar/u/0?cid=MDI1ODI1MDdiYWM3OWQxODY5MDA3MTI1NjZlYzNmYzY5YjMzYWMyNGQ3ZGUwYThjNzZjN2IxOTk3NmYxOTBjMEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t>`__
      - `Meeting details/agenda: <https://docs.google.com/document/d/1QcmUlWftPlBi-Wz6b6PipqJfvjpJ-OuRMRnN9Dm2t0c>`__
 
+Past online sync-ups
+^^^^^^^^^^^^^^^^^^^^
+
+Some online sync-ups are no longer happening. We keep pointing to them here to
+keep track of the meeting notes and in case anyone would want to revive them in
+the future.
+
+.. list-table:: LLVM no-longer-happening sync-up calls
+   :widths: 25 25 25 25
+   :header-rows: 1
+
+   * - Topic
+     - Frequency
+     - Calendar link
+     - Minutes/docs link
+   * - Scalable Vectors and Arm SVE
+     - Monthly, every 3rd Tuesday
+     - `ics <https://calendar.google.com/calendar/ical/bjms39pe6k6bo5egtsp7don414%40group.calendar.google.com/public/basic.ics>`__
+       `gcal <https://calendar.google.com/calendar/u/0/embed?src=bjms39pe6k6bo5egtsp7don414@group.calendar.google.com>`__
+     - `Minutes/docs <https://docs.google.com/document/d/1UPH2Hzou5RgGT8XfO39OmVXKEibWPfdYLELSaHr3xzo/edit>`__
+   * - MemorySSA in LLVM
+     - Every 8 weeks on Mondays
+     - `ics <https://calendar.google.com/calendar/ical/c_1mincouiltpa24ac14of14lhi4%40group.calendar.google.com/public/basic.ics>`__
+       `gcal <https://calendar.google.com/calendar/embed?src=c_1mincouiltpa24ac14of14lhi4%40group.calendar.google.com>`__
+     - `Minutes/docs <https://docs.google.com/document/d/1-uEEZfmRdPThZlctOq9eXlmUaSSAAi8oKxhrPY_lpjk/edit#>`__
+   * - GlobalISel
+     - Every 2nd Tuesday of the month
+     - `gcal <https://calendar.google.com/calendar/u/0?cid=ZDcyMjc0ZjZiZjNhMzFlYmE3NTNkMWM2MGM2NjM5ZWU3ZDE2MjM4MGFlZDc2ZjViY2UyYzMwNzVhZjk4MzQ4ZEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t>`__
+     - `Meeting details/agenda <https://docs.google.com/document/d/1Ry8O4-Tm5BFj9AMjr8qTQFU80z-ptiNQ62687NaIvLs/edit?usp=sharing>`__
+   * - LLVM SPIR-V Backend Working Group
----------------
michalpaszkowski wrote:

No problem! Though I agree we should come up with some reliable way to track the active/inactive meetings and thank you for taking on this work!

Also, I just noticed that the meeting date has not been updated for the SPIR-V backend working group. Would you please update the meeting day to "Every week on Monday", so that it matches the meeting details document?

https://github.com/llvm/llvm-project/pull/89361