Rollup merge of #150495 - androm3da:bcain/unwind_fix, r=Mark-Simulacrum

Correct hexagon "unwinder_private_data_size"

Discovered while porting libstd to hexagon-unknown-qurt: the unwinder data size refers to the count of pointers in _Unwind_Exception but when I put the value "35" intiially for hexagon linux, I incorrectly considered the size of the exception context hexagon_thread_state_t data structure.

Correct the value for hexagon linux and expand it to cover all hexagon architecture instead.

Author: JonathanBrouwer