Change Fragments to ImmutableList
Change Fragments to ImmutableList

This is in preparation to avoid boxing the enumerator.

sean-gilliam/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,mono/msbuild,mono/msbuild,chipitsine/msbuild,sean-gilliam/msbuild,Microsoft/msbuild,cdmihai/msbuild,jeffkl/msbuild,chipitsine/msbuild,cdmihai/msbuild,jeffkl/msbuild,jeffkl/msbuild,rainersigwald/msbuild,cdmihai/msbuild,Microsoft/msbuild,chipitsine/msbuild,mono/msbuild,AndyGerlicher/msbuild,Microsoft/msbuild,mono/msbuild,Microsoft/msbuild,jeffkl/msbuild,chipitsine/msbuild,sean-gilliam/msbuild