Added UIUC License

LICENSE

+University of Illinois/NCSA Open Source License
+
+Copyright (c) 2020 UIUC LLVM Group. All rights reserved.
+
+Developed by: The UIUC LLVM Group
+              University of Illinois at Urbana Champaign
+              https://hpvm.cs.illinois.edu
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation files
+(the "Software"), to deal with the Software without restriction,
+including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software,
+and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+* Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimers.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimers in the
+  documentation and/or other materials provided with the distribution.
+
+* Neither the names of [fullname], [project] nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this Software without specific prior written permission.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH
+THE SOFTWARE.