Analyze shared memory alias (#81)

The purpose of this PR is analyzing shared memory aliases so that we can
fix memory allocation bugs and save memory allocations in triton code
involving complex control flows.

Changes to memory bar and allocation are on the way.

Co-authored-by: Philippe Tillet <phil@openai.com>

lib/Analysis/CMakeLists.txt

@@ -2,6 +2,8 @@ add_mlir_library(TritonAnalysis
   AxisInfo.cpp
   Allocation.cpp
   Membar.cpp
+  Alias.cpp
+  Utility.cpp
 
   DEPENDS
   TritonGPUAttrDefsIncGen