[Bug libc/19292] New: Improve __assert_fail debuggability

[avi@cloudius-systems.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19292

            Bug ID: 19292
           Summary: Improve __assert_fail debuggability
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: avi@cloudius-systems.com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Often when one is debugging an assert(), the variables in the frame that
triggered the assertion failure are marked as "optimized out" by the debugger. 
Often this is because the asnprintf() call in __assert_fail() clobbered the
registers they were held in, and so the debugger cannot recover their values.

This can easily be fixed by having __assert_fail() save all registers on its
own stack frame, with an appropriate DWARF annotation, so that the debugger can
inspect the variables' values.

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