BeginSample method implementation is missing on iOS builds, this results in Profiler failing to profile on iOS - 'Non matching Profiler.EndSample (BeginSample and EndSample count must match)' errors are thrown in Xcode console. BeginSample method in Classes/Native/Bulk_UnityEngine_0.cpp is empty, however, EndSample is not.

Steps to reproduce:
1) Open the attached project.
2) Build a Developmental iOS build.
3) Run on a device.
4) In Unity, open Window > Profiler.
5) Select the connected iOS device as Active Profiler target.

In Xcode console, errors show up:
Non matching Profiler.EndSample (BeginSample and EndSample count must match)
(Filename: /Users/builduser/buildslave/unity/build/Runtime/Profiler/PerThreadProfiler.cpp Line: 293)

The profiling process does not start. This happens with Mono2x and IL2cpp. Disabling Engine Code Stripping does not help as well.

Reproduced on:
5.5.0b8, 5.5.0b4

Did not reproduce:
5.5.0b3