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, 5 insertions, 2 deletions

diff --git a/source/slang/lower-to-ir.cpp b/source/slang/lower-to-ir.cpp
index c8e010f7d..5e7e05a23 100644
--- a/source/slang/lower-to-ir.cpp
+++ b/source/slang/lower-to-ir.cpp
@@ -705,7 +705,6 @@ LoweredValInfo emitCallToDeclRef(
             CASE(kIRPseudoOp_PostInc, kIROp_Add);
             CASE(kIRPseudoOp_PostDec, kIROp_Sub);
 #undef CASE
-
             default:
                 SLANG_UNIMPLEMENTED_X("IR pseudo-op");
                 break;
@@ -1197,6 +1196,11 @@ struct ExprLoweringVisitorBase : ExprVisitor<Derived, LoweredValInfo>
         SLANG_UNEXPECTED("overloaded expressions should not occur in checked AST");
     }
 
+    LoweredValInfo visitOverloadedExpr2(OverloadedExpr2* /*expr*/)
+    {
+        SLANG_UNEXPECTED("overloaded expressions should not occur in checked AST");
+    }
+
     LoweredValInfo visitIndexExpr(IndexExpr* expr)
     {
         auto type = lowerType(context, expr->type);
@@ -3521,7 +3525,6 @@ struct DeclLoweringVisitor : DeclVisitor<DeclLoweringVisitor, LoweredValInfo>
         for( auto paramInfo : parameterLists.params )
         {
             RefPtr<Type> irParamType = lowerSimpleType(context, paramInfo.type);
-
             switch( paramInfo.direction )
             {
             case kParameterDirection_In: