Add type annotation to fix FS0072 in bootstrap build

The bootstrap compiler needs an explicit type annotation on the 'g' parameter
in GenAttribArg to resolve g.ilg.typ_Object, since g's type is not constrained
until later match cases (TypeOfExpr, EnumExpr, etc.).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: T-Gro

src/Compiler/CodeGen/IlxGen.fs

@@ -10182,7 +10182,7 @@ and EmitRestoreStack cgbuf (savedStack, savedStackLocals) =
 //GenAttr: custom attribute generation
 //-------------------------------------------------------------------------
 
-and GenAttribArg amap g eenv x (ilArgTy: ILType) =
+and GenAttribArg amap (g: TcGlobals) eenv x (ilArgTy: ILType) =
 
     match stripDebugPoints x, ilArgTy with
     // Detect 'null' used for an array argument