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tsubst_lambda_expr was producing a function with two blocks that claimed to be the outermost block in the function body, one from the call to start_lambda_function in tsubst_lambda_expr, and one from tsubsting the block added by start_lambda_function when we first parsed the lambda. This messed with the named return value optimization, which only works for variables in the outermost block. gcc/cp/ChangeLog: PR c++/91217 * pt.c (tsubst_lambda_expr): Skip the body block from DECL_SAVED_TREE. gcc/testsuite/ChangeLog: PR c++/91217 * g++.dg/opt/nrv20.C: New test.
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