Ivan Grokhotkov bd598e36ea newlib: stdatomic: implement missing "op_fetch", "nand" builtins ...

* Adds implementations of __{atomic,sync}_nand_fetch_n. These builtins
  were implemented for other operations but were not defined for NAND.
* Adds implementation of __atomic_OP_fetch_n for all OPs.
* Adds implementation of __sync_OP_and_fetch_n for all OPs.

Reported in https://github.com/espressif/arduino-esp32/issues/5948

2021-12-21 02:16:02 +01:00

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