Fix lambda generators: StopIteration should wrap last sent value

Author: steve-s

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags_bytecode_dsl/test_generators.txt

@@ -17,6 +17,7 @@ test.test_generators.ExceptionTest.test_return_stopiteration @ linux-x86_64
 test.test_generators.ExceptionTest.test_return_tuple @ linux-x86_64
 test.test_generators.ExceptionTest.test_stopiteration_error @ linux-x86_64
 test.test_generators.ExceptionTest.test_tutorial_stopiteration @ linux-x86_64
+test.test_generators.FinalizationTest.test_lambda_generator @ linux-x86_64
 test.test_generators.GeneratorStackTraceTest.test_send_with_yield_from @ linux-x86_64
 test.test_generators.GeneratorStackTraceTest.test_throw_with_yield_from @ linux-x86_64
 test.test_generators.GeneratorTest.test_copy @ linux-x86_64

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/compiler/bytecode_dsl/RootNodeCompiler.java

@@ -926,10 +926,10 @@ private BytecodeDSLCompilerResult compileTypeAliasTypeParameters(String name, By
     @Override
     public BytecodeDSLCompilerResult visit(ExprTy.Lambda node) {
         return compileRootNode("<lambda>", ArgumentInfo.fromArguments(node.args), node.getSourceRange(),
-                        b -> emitFunctionDefBody(node, node.args, new SSTNode[]{node.body}, b, null, !scope.isGenerator()));
+                        b -> emitFunctionDefBody(node, node.args, new SSTNode[]{node.body}, b, null, true));
     }
 
-    private void emitFunctionDefBody(SSTNode node, ArgumentsTy args, SSTNode[] body, Builder b, Object docstring, boolean isRegularLambda) {
+    private void emitFunctionDefBody(SSTNode node, ArgumentsTy args, SSTNode[] body, Builder b, Object docstring, boolean isLambda) {
         beginRootNode(node, args, b);
 
         int i = 0;
@@ -946,7 +946,7 @@ private void emitFunctionDefBody(SSTNode node, ArgumentsTy args, SSTNode[] body,
 
         StatementCompiler statementCompiler = new StatementCompiler(b);
 
-        if (isRegularLambda) {
+        if (isLambda) {
             assert i == 0;
             assert body[0] instanceof ExprTy;
             beginReturn(b);