[libcxx][fstream][NFC] Make __failed helper lambda a member function (#149390) This patch makes the `__failed` lambda a member function on `fstream`. This fixes two LLDB expression evaluation test failures that got introduced with https://github.com/llvm/llvm-project/pull/147389: ``` 16:22:51 ******************** 16:22:51 Unresolved Tests (2): 16:22:51 lldb-api :: commands/expression/import-std-module/list-dbg-info-content/TestDbgInfoContentListFromStdModule.py 16:22:51 lldb-api :: commands/expression/import-std-module/list/TestListFromStdModule.py ``` The expression evaluator is asserting in the Clang parser: ``` Assertion failed: (capture_size() == Class->capture_size() && "Wrong number of captures"), function LambdaExpr, file ExprCXX.cpp, line 1277. PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace. ``` Ideally we'd figure out why LLDB is falling over on this lambda. But to unblock CI for now, make this a member function. In the long run we should figure out the LLDB bug here so libc++ doesn't need to care about whether it uses lambdas like this or not.
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