This did not reproduce with Microsoft Visual Studio version 15.6.2 at the same CL in //UE/Main. Only occurred after I updated from 15.6.2 to 15.7.1.
Setup:
Have Visual Studio 2017 version 15.7.1 on your machine
Repro:
Result:
Project fails during the build phase with multiple errors similar to 
ATHelper: Packaging (Windows (32-bit)): Error executing C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.14.26428\bin\HostX64\x86\cl.exe (tool returned code: 2) UATHelper: Packaging (Windows (32-bit)): PCH.CoreUObject.cpp UATHelper: Packaging (Windows (32-bit)): c1xx: fatal error C1356: unable to find mspdbcore.dll
Expected:
Project packages a Win32 development build successfully
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-59150 in the post.
| 16 | 
| Component | UE - Foundation - Core | 
|---|---|
| Affects Versions | 4.20 | 
| Target Fix | 4.20 | 
| Created | May 15, 2018 | 
|---|---|
| Resolved | May 29, 2018 | 
| Updated | Sep 23, 2019 |