Sharing Material shaders wastes memory and disappears from the memreport

Enabling bShareMaterialShaderCode breaks memory tracking and wastes memory due to issues in ShaderCodeLibrary. It is also worth noting that after cooking with bShareMaterialShaderCode enabled causes the tracking for the pixel and vertex shaders to disappear from the memreport.

Tested in 4.21.2 (CL - 4753647), 4.22.3 (CL - 7053647), 4.23 (CL - 7247482), 4.24 (CL - 7235487)

1. Download the attached project
2. Open the NewMap map
3. Content for Windows
4. PIE
5. Enter memreport as console command
6. Enable Share Material Shader Code in packaging settings in Project settings
7. Repeat steps 3-5
8. Open the Memreports in notepad (Located in <Project Name>/Saved/Profiling/MemReports)

Expected: The memreports would be identical in terms of shader code memory usage

Result: The memreport that was taken after enabling Share Material Shader code consumes more memory

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