dce: add remove_unused_locals conditionally to the todos [PR117096]

dce: add remove_unused_locals conditionally to the todos [PR117096]

This is the updated patch with the suggestion from:
https://gcc.gnu.org/pipermail/gcc-patches/2024-October/665217.html
Where we use a second arg/param to set which passes we want to have
the remove_unused_locals on the dce.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	PR tree-optimization/117096
	* passes.def: Update some of the dce/cd-cde passes setting
	the 2nd arg to true.
	Also remove comment about stdarg since dce does it.
	* tree-ssa-dce.cc (pass_dce): Add remove_unused_locals_p field.
	Update set_pass_param to allow for 2nd param.
	Use remove_unused_locals_p in execute to return TODO_remove_unused_locals.
	(pass_cd_dce): Likewise.
	* tree-stdarg.cc (pass_data_stdarg): Remove TODO_remove_unused_locals.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>