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>

bin/triton-opt.cpp

@@ -12,6 +12,7 @@
 
 namespace mlir {
 namespace test {
+void registerTestAliasPass();
 void registerTestAlignmentPass();
 void registerTestAllocationPass();
 void registerTestMembarPass();
@@ -22,6 +23,7 @@ int main(int argc, char **argv) {
   mlir::registerAllPasses();
   mlir::registerTritonPasses();
   mlir::registerTritonGPUPasses();
+  mlir::test::registerTestAliasPass();
   mlir::test::registerTestAlignmentPass();
   mlir::test::registerTestAllocationPass();
   mlir::test::registerTestMembarPass();