TelemetryTest.cpp: Suppress a warning in #121003 [-Wunused-private-field]

Reapply "[llvm]Add a simple Telemetry framework" (#120769) (#121003)

This reverts commit 2ec6174bef4bc9ef3d5cedbffd7169017c9669c3.

New changes:
- Use explicit overloads of write(<int types>)

Reapply "[llvm]Add a simple Telemetry framework" (#120769) (#121003)

This reverts commit 2ec6174bef4bc9ef3d5cedbffd7169017c9669c3.

New changes:
- Use explicit overloads of write(<int types>)
- Fix link error due to missing dependency (lib/Support)
- Updated tests and docs

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[llvm]Add a simple Telemetry framework (#102323)

Objective:

- Provide a common framework in LLVM for collecting various usage
metrics
- Characteristics:
- Extensible and configurable by:

[llvm]Add a simple Telemetry framework (#102323)

Objective:

- Provide a common framework in LLVM for collecting various usage
metrics
- Characteristics:
- Extensible and configurable by:
- tools in LLVM that want to use it
- vendors in their downstream codebase
- tools users (as allowed by vendor)


Background:
The framework was originally proposed only for LLDB, but there were
quite a few requests to move it to llvm/lib given telemetry
is a common use case in a lot of tools, not just LLDB.

See more details on the design and discussions here on the RFC:
https://discourse.llvm.org/t/rfc-lldb-telemetry-metrics/64588/20?u=oontvoo

---------

Co-authored-by: Alina Sbirlea <alina.g.simion@gmail.com>
Co-authored-by: James Henderson <James.Henderson@sony.com>
Co-authored-by: Pavel Labath <pavel@labath.sk>

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