[pull] master from erlang:master

[pull]

See Commits and Changes for more details.

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Created by pull[bot] (v2.0.0-alpha.1)

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Summary by Sourcery

Build:

• Change debug CFLAGS from -O0 to -Og.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request integrates several improvements across the Erlang runtime system. The changes include enhancements to debug logging, memory allocation and variable initialization, better handling of scheduler state in NIF selections, improved assertions in tree search, and updated compiler debug flags. Overall, the modifications refine diagnostic outputs and ensure more robust and safe code behavior.

Updated Class Diagram: ErtsSchedulerData Modifications (Class Diagram)

classDiagram
    class ErtsSchedulerData {
      +int no
      +ErtsSysFdType[] nif_select_fds
      +... // other attributes
    }

    note for ErtsSchedulerData "PR modification: clears the NIF select marker in scheduler data to avoid re-trigger issues; improves runtime safety."

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File-Level Changes

Change	Details	Files
Enhanced debug logging and scheduler handling in event I/O checks.	Updated the DEBUG_PRINT macro to include an additional count parameter for better traceability. Modified the event state flag conversion by removing redundant flag combinations. Added a loop to clear the NIF_SELECT marker from scheduler data to prevent premature re-triggering of file descriptors.	erts/emulator/sys/common/erl_check_io.c
Refactored memory pointer initialization and loop structure in tuple creation.	Replaced the global heap pointer with a locally declared variable during heap allocation. Adjusted the loop indentation and structure to properly assign values while converting list elements.	erts/emulator/beam/bif.c
Fixed tracer initialization in process spawn tracing.	Initialized the mfa variable properly by assigning a default non-value. Modified the conditional allocation to use a locally defined heap pointer to avoid using an uninitialized pointer.	erts/emulator/beam/erl_trace.c
Improved debug assertions in binary tree search routines.	Introduced a debug sentinel value for the 'lastobj' variable to detect invalid states. Added an assertion to ensure that 'lastobj' was properly updated after traversal.	erts/emulator/beam/erl_db_tree.c
Updated compiler debug flags for optimized debugging builds.	Changed DEBUG_CFLAGS in the configure script from '-O0' to '-Og' to enable optimizations that benefit debugging.	erts/configure.ac
Added macro calls to ensure proper variable initialization and avoid undefined behavior.	Inserted an ERTS_UNDEF call for the 'reason' variable in the process signal queue handling. Added an ERTS_UNDEF call for the 'last' pointer in persistent monitor messages. Introduced an ERTS_UNDEF call for the 'saved_used_size' variable in the NIF environment debugging function. Included an ERTS_UNDEF call for the 'cdir' variable inside the red-black tree traversal debug block.	erts/emulator/beam/erl_proc_sig_queue.c erts/emulator/beam/erl_nif.c erts/emulator/beam/erl_rbtree.h
Metadata update in the configuration file.	Minor or automatic configuration file adjustments that were recorded without specific code changes.	erts/configure

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