Linux version of the debugger is larger than macOS version

[gregg-miskelly]

Environment data

C# Extension version: 1.12.0-beta3

The Linux version of the debugger package is > 2x the size of the OSX package.
63277583 coreclr-debug-linux-x64.zip
26583206 coreclr-debug-osx.10.11-x64.zip

There are four reasons I see for this:

1. There is a bug in the OSX package - it looks like we aren't using NI images on OSX.
2. The Linux package seems to have both .ni and regular dlls
3. The vsdbg native libraries are all much larger their their OSX counter parts
4. The CoreCLR native libraries are a little bigger than their OSX counter parts

Here is the difference in size for various native files
libvsdbg.so 1,5648,513
libvsdebugeng.impl.so 1,164,1020
libvsdebugeng.so 1,150,6621
libcoreclr.so 1,881,138
libvsbaseservices.so 1,657,427
libmscordaccore.so 523,206
libmscordbi.so 415,900
libclrjit.so 173,278
libdbgshim.so 147,334
System.Security.Cryptography.Native.OpenSsl.so 121,480
System.Security.Cryptography.OpenSsl.dll 88,064
vsdbg 64691
vsdbg-ui 63031

[gregg-miskelly]

One think we might want to try is to switch to llvm-link, and possibly enable Link-Time-Optimizations (LTO) -- https://stackoverflow.com/questions/35922966/lto-with-llvm-and-cmake.

CoreCLR seems to use llvm-link already: coreclr\src\pal\tools\gen-buildsys-clang.sh(172): "-DCMAKE_LINKER=$llvm_link" \

[gregg-miskelly]

1 and 2 are now fixed, so the packages are much closer now. Leave this open to track 3.