[llvm] [VPlan] Move predication to VPlanTransform (NFC). (PR #128420)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 2 "checkout".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/180/builds/17958

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (checkout) failure: update (failure)
...
Resolving deltas:  58% (92/158)
Resolving deltas:  59% (94/158)
Resolving deltas:  60% (95/158)
Resolving deltas:  61% (97/158)
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Resolving deltas:  64% (102/158)
Resolving deltas:  65% (103/158)
Resolving deltas:  66% (105/158)
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Resolving deltas:  68% (108/158)
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Resolving deltas:  70% (111/158)
Resolving deltas:  71% (113/158)
Resolving deltas:  72% (114/158)
Resolving deltas:  73% (116/158)
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Resolving deltas:  75% (119/158)
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Resolving deltas:  77% (122/158)
Resolving deltas:  78% (124/158)
Resolving deltas:  79% (125/158)
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Resolving deltas:  94% (149/158)
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Resolving deltas:  97% (154/158)
Resolving deltas:  98% (155/158)
Resolving deltas:  99% (157/158)
Resolving deltas: 100% (158/158)
Resolving deltas: 100% (158/158), completed with 124 local objects.
>From https://github.com/llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
Auto packing the repository in background for optimum performance.
See "git help gc" for manual housekeeping.
fatal: sha1 file '/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/.git/index.lock' write error. Out of diskspace
fatal: sha1 file '/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx-nvidia-ubuntu/llvm-project/.git/index.lock' write error. Out of diskspace

```

</details>

https://github.com/llvm/llvm-project/pull/128420