Rename emit context for issue 516 refactor

Agent-Logs-Url: https://github.com/dadhi/FastExpressionCompiler/sessions/8f07bd08-0438-44f4-a414-f9328a8f1f04

Co-authored-by: dadhi <39516+dadhi@users.noreply.github.com>

Author: Copilot

src/FastExpressionCompiler/FastExpressionCompiler.cs

@@ -2066,15 +2066,15 @@ public static class EmittingVisitor
             private static readonly MethodInfo _objectEqualsMethod =
                 ((Func<object, object, bool>)object.Equals).Method;
 
-            private struct FastExpressionCompiler
-            {
+            private struct EmitContext
+            {
                 private readonly ParamExprs _paramExprs;
                 private readonly ILGenerator _il;
                 private readonly CompilerFlags _setup;
 
                 public ClosureInfo Closure;
 
-                public FastExpressionCompiler(ParamExprs paramExprs, ILGenerator il, ClosureInfo closure, CompilerFlags setup)
+                public EmitContext(ParamExprs paramExprs, ILGenerator il, ClosureInfo closure, CompilerFlags setup)
                 {
                     _paramExprs = paramExprs;
                     _il = il;
@@ -2091,7 +2091,7 @@ public static bool TryEmit(Expression expr,
                 ParamExprs paramExprs,
                 ILGenerator il, ref ClosureInfo closure, CompilerFlags setup, ParentFlags parent, int byRefIndex = -1)
             {
-                var compiler = new FastExpressionCompiler(paramExprs, il, closure, setup);
+                var compiler = new EmitContext(paramExprs, il, closure, setup);
                 var emitted = compiler.TryEmit(expr, parent, byRefIndex);
                 closure = compiler.Closure;
                 return emitted;