[clang] Adding support for iterator in motion clauses. (PR #159112)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-win` running on `sie-win-worker` while building `clang` at step 2 "checkout".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/46/builds/27128

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

```
Step 2 (checkout) failure: update (failure)
...
remote: Counting objects:  86% (50/58)        
remote: Counting objects:  87% (51/58)        
remote: Counting objects:  89% (52/58)        
remote: Counting objects:  91% (53/58)        
remote: Counting objects:  93% (54/58)        
remote: Counting objects:  94% (55/58)        
remote: Counting objects:  96% (56/58)        
remote: Counting objects:  98% (57/58)        
remote: Counting objects: 100% (58/58)        
remote: Counting objects: 100% (58/58), done.        
remote: Compressing objects:   3% (1/29)        
remote: Compressing objects:   6% (2/29)        
remote: Compressing objects:  10% (3/29)        
remote: Compressing objects:  13% (4/29)        
remote: Compressing objects:  17% (5/29)        
remote: Compressing objects:  20% (6/29)        
remote: Compressing objects:  24% (7/29)        
remote: Compressing objects:  27% (8/29)        
remote: Compressing objects:  31% (9/29)        
remote: Compressing objects:  34% (10/29)        
remote: Compressing objects:  37% (11/29)        
remote: Compressing objects:  41% (12/29)        
remote: Compressing objects:  44% (13/29)        
remote: Compressing objects:  48% (14/29)        
remote: Compressing objects:  51% (15/29)        
remote: Compressing objects:  55% (16/29)        
remote: Compressing objects:  58% (17/29)        
remote: Compressing objects:  62% (18/29)        
remote: Compressing objects:  65% (19/29)        
remote: Compressing objects:  68% (20/29)        
remote: Compressing objects:  72% (21/29)        
remote: Compressing objects:  75% (22/29)        
remote: Compressing objects:  79% (23/29)        
remote: Compressing objects:  82% (24/29)        
remote: Compressing objects:  86% (25/29)        
remote: Compressing objects:  89% (26/29)        
remote: Compressing objects:  93% (27/29)        
remote: Compressing objects:  96% (28/29)        
remote: Compressing objects: 100% (29/29)        
remote: Compressing objects: 100% (29/29), done.        
remote: Total 64 (delta 29), reused 48 (delta 28), pack-reused 6 (from 2)        
>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 '.git/objects/pack/tmp_pack_ZTR63B' write error. Out of diskspace
fatal: failed to run repack
error: task 'gc' failed
fatal: sha1 file 'Z:/b/llvm-clang-x86_64-sie-win/llvm-project/.git/index.lock' write error. Out of diskspace
fatal: sha1 file 'Z:/b/llvm-clang-x86_64-sie-win/llvm-project/.git/index.lock' write error. Out of diskspace

```

</details>

https://github.com/llvm/llvm-project/pull/159112