Handle inline asm in vector alias

1. Improve vector alias optim to handle inline asm
2. Allow constant insert elements

IGC/Compiler/CISACodeGen/DeSSA.cpp

@@ -1542,7 +1542,7 @@ bool DeSSA::isAliasee(Value *V) const {
 //      c = 2
 //      ...
 //   L:   = a
-//        = b
+//        = c
 //
 //  In this case, if a is aliased to b, a would get 2 at L, but the correct
 //  value should be 1. In order to find out if a can be aliased to b, it