Support parameters with local symbols to fix #3

Works with Apple clang version 13.1.6 (clang-1316.0.21.2)

Author: praeclarum

Iril/Compilation.cs

@@ -2213,10 +2213,10 @@ public void WriteAssembly (string path)
             if (hasEntryPoint) {
                 var text = @"{
     ""runtimeOptions"": {
-        ""tfm"": ""netcoreapp2.1"",
+        ""tfm"": ""net6.0"",
         ""framework"": {
             ""name"": ""Microsoft.NETCore.App"",
-            ""version"": ""2.1.0""
+            ""version"": ""6.0.0""
         }
     }
 }

Iril/IR/FunctionDefinition.cs

@@ -122,6 +122,7 @@ public enum ParameterAttributes
         NoAlias         = 1 << 10,
         Align8          = 1 << 11,
         Byval           = 1 << 12,
+        NoUndef         = 1 << 13,
     }
 
     public class FunctionDeclaration

Iril/IR/IR.jay

@@ -40,6 +40,7 @@ namespace Iril.IR
 %token FCMP OEQ OGT OGE OLT OLE ONE ORD UEQ UNE UNO
 %token PHI SELECT CALL TAIL VA_ARG ASM SIDEEFFECT
 %token LANDINGPAD CATCH CATCHPAD CLEANUPPAD
+%token NOUNDEF
 
 %start module
 
@@ -532,10 +533,18 @@ parameter
     {
         $$ = new Parameter (LocalSymbol.None, (LType)$1);
     }
+    | type LOCAL_SYMBOL
+    {
+        $$ = new Parameter ((LocalSymbol)$2, (LType)$1);
+    }
     | type parameter_attributes
     {
         $$ = new Parameter (LocalSymbol.None, (LType)$1);
     }
+    | type parameter_attributes LOCAL_SYMBOL
+    {
+        $$ = new Parameter ((LocalSymbol)$3, (LType)$1);
+    }
     | METADATA
     {
         $$ = new Parameter (LocalSymbol.None, IntegerType.I32);
@@ -557,6 +566,7 @@ parameter_attributes
 parameter_attribute
     : NONNULL   { $$ = ParameterAttributes.NonNull; }
     | NOCAPTURE { $$ = ParameterAttributes.NoCapture; }
+    | NOUNDEF   { $$ = ParameterAttributes.NoUndef; }
     | READONLY  { $$ = ParameterAttributes.ReadOnly; }
     | WRITEONLY { $$ = ParameterAttributes.WriteOnly; }
     | READNONE  { $$ = ParameterAttributes.ReadNone; }

Iril/IR/Lexer.cs

@@ -65,6 +65,7 @@ class MultiCharToken
             { Symbol.Intern ("phi"), Token.PHI },
             { Symbol.Intern ("ret"), Token.RET },
             { Symbol.Intern ("nocapture"), Token.NOCAPTURE },
+            { Symbol.Intern ("noundef"), Token.NOUNDEF },
             { Symbol.Intern ("writeonly"), Token.WRITEONLY },
             { Symbol.Intern ("readonly"), Token.READONLY },
             { Symbol.Intern ("attributes"), Token.ATTRIBUTES },