[llvm] [IR] Do not track metadata uses of ConstantData (PR #223303)

[Fangrui Song via llvm-commits]

MaskRay wrote:

% ct_table.rb 'https://llvm-compile-time-tracker.com/compare.php?from=eb5c148b1cbc89c75a57a505d2533ae52e5bde44&to=ccb9c70ed53e460b0f8e8716c110e90194e08bbd&stat=instructions:u'
CTMark geomean `instructions:u`: 🟢 3 improved (best -0.07%) · 5 within noise.

| Config                | instructions:u |   σ |       max-rss |
| :-------------------- | -------------: | --: | ------------: |
| stage1-O3             |         +0.01% | 1.1 |        -0.12% |
| stage1-ReleaseThinLTO |         -0.02% | 1.9 |        -0.09% |
| stage1-ReleaseLTO-g   |  🟢 **-0.07%** | 5.2 | 🟢 **-0.48%** |
| stage1-O0-g           |  🟢 **-0.06%** | 3.6 |        -0.13% |
| stage1-aarch64-O3     |         -0.01% | 0.5 |        -0.15% |
| stage1-aarch64-O0-g   |         -0.05% | 2.3 |        -0.21% |
| stage2-O3             |         -0.00% | 0.2 |        -0.02% |
| stage2-O0-g           |  🟢 **-0.07%** | 3.2 |        -0.04% |

https://github.com/llvm/llvm-project/pull/223303