Reproduction steps:
1) Open "case_794402_ShaderCrash.zip" project
2) Open "TestScene" scene
3) Select "cloth_plane_test" object in hierarchy
4) Change "cloth_plane_test" object's material's shader to ".This crashes/multi_compile_instancing crash" (or add "Instancing" material on this object)

Expected result:
Works as described

Actual result:
Unity crashes

Note:
On Unity version 5.4.0b15 this does not crash, but issue still exists: plane becomes invisible.

Regression started from 5.4.0b16