Add crossgen script

build/scripts/crossgen.sh

+#!/usr/bin/env bash
+#
+# Copyright (c) .NET Foundation and contributors. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+#
+
+set -e
+
+BIN_DIR="$( cd $1 && pwd )"
+
+UNAME=`uname`
+
+if [ -z "$RID" ]; then
+    if [ "$UNAME" == "Darwin" ]; then
+        RID=osx.10.10-x64
+    elif [ "$UNAME" == "Linux" ]; then
+        RID=ubuntu.14.04-x64
+    else
+        echo "Unknown OS: $UNAME" 1>&2
+        exit 1
+    fi
+fi
+
+# Replace with a robust method for finding the right crossgen.exe
+CROSSGEN_UTIL=$HOME/.nuget/packages/runtime.$RID.Microsoft.NETCore.Runtime.CoreCLR/1.0.1-beta-23504/tools/crossgen
+
+cd $BIN_DIR
+
+# Crossgen currently requires itself to be next to mscorlib
+cp $CROSSGEN_UTIL $BIN_DIR
+chmod +x crossgen
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR mscorlib.dll
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR System.Collections.Immutable.dll
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR System.Reflection.Metadata.dll
+
+./crossgen -nologo -MissingDependenciesOK -platform_assemblies_paths $BIN_DIR Microsoft.CodeAnalysis.dll
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR Microsoft.CodeAnalysis.CSharp.dll
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR Microsoft.CodeAnalysis.VisualBasic.dll
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR csc.exe
+
+./crossgen -nologo -platform_assemblies_paths $BIN_DIR vbc.exe