[PATCH v4 0/3][RFC]Provide more contexts for -Warray-bounds and -Wstringop-* warning messages

[Qing Zhao]

Hi,

This is the 4th version of the patch for fixing PR109071.

Compared to the 3nd version:
https://gcc.gnu.org/pipermail/gcc-patches/2024-October/666870.html
https://gcc.gnu.org/pipermail/gcc-patches/2024-October/666872.html
https://gcc.gnu.org/pipermail/gcc-patches/2024-October/666871.html

The major improvements to this patch are:

1. Divide the patch into 3 parts:
    Part 1: Add new data structure move_history, record move_history during
            transformation;
    Part 2: In warning analysis, Use the new move_history to form a rich
            location with a sequence of events, to report more context info
            of the warnings.
    Part 3: Add debugging mechanism for move_history.

2. Major change to the above Part 2, completely rewritten based on David's
   new class lazy_diagnostic_path. 

3. Fix all issues identied By Sam;
   A. fix PR117375 (Bug in tree-ssa-sink.cc);
   B. documentation clarification;
   C. Add all the duplicated PRs in the commit comments;

4. Bootstrap GCC with the new -fdiagnostics-details on by default (Init (1)).
   exposed some ICE similar as PR117375 in tree-ssa-sink.cc, fixed.


bootstrapping and regression testing on both x86 and aarch64.

Please let me know any comment and suggestion.

Thanks.

Qing
Qing Zhao (3):
  Provide more contexts for -Warray-bounds, -Wstringop-* warning
    messages due to code movements from compiler transformation (Part 1)
    [PR109071,PR85788,PR88771,PR106762,PR108770,PR115274,PR117179]
  Provide more contexts for -Warray-bounds, -Wstringop-* warning
    messages due to code movements from compiler transformation (Part 2)
    [PR109071,PR85788,PR88771,PR106762,PR108770,PR115274,PR117179]
  Provide more contexts for -Warray-bounds, -Wstringop-* warning
    messages due to code movements from compiler transformation (Part 3)
    [PR109071,PR85788,PR88771,PR106762,PR108770,PR115274,PR117179]