Remove ReferenceAssemblyAttribute and 0x70 AssemblyFlag bit from shims
Remove ReferenceAssemblyAttribute and 0x70 AssemblyFlag bit from shims

We want to use the shims at runtime as well and the loader will block
them if they have that runtime bit set on them so we need to clear that
bit from them.

weshaggard/standard,ericstj/standard,weshaggard/standard,ericstj/standard