All compiler fixes to get ir branch work with falcor feature demo.

- support overloaded generic function. this involves adding a new expression type, `OverloadedExpr2` to hold the candidate expressions for the generic function decl being referenced.
- make BitNot a normal IROp instead of an IRPseudoOp
- make sure we clone the decorations of parameters when cloning ir functions
- propagate geometry shader entry point attributes (`[maxvertexcount]` and `[instance]`) through HLSL emit
- IR emit: handle geometry shader entry-point parameter decorations, such as 'triangle'.
- IR emit: treat geometry shader stream output typed ir value as `should fold into use`.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/slang/ast-legalize.cpp b/source/slang/ast-legalize.cpp
index 996a66eac..5df6b80f5 100644
--- a/source/slang/ast-legalize.cpp
+++ b/source/slang/ast-legalize.cpp
@@ -5091,6 +5091,14 @@ struct FindIRDeclUsedByASTVisitor
         // TODO: need to walk the lookup result too
     }
 
+    void visitOverloadedExpr2(OverloadedExpr2* expr)
+    {
+        walkExpr(expr->base);
+        for (auto & candidate : expr->candidiateExprs)
+            walkExpr(candidate);
+    }
+
+
     void visitConstantExpr(ConstantExpr*)
     {}