[Bug testsuite/30122] New: [gdb/cli] Add maint check-prologue

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30122

            Bug ID: 30122
           Summary: [gdb/cli] Add maint check-prologue
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I see two conflicting goals:
- we want the testsuite to check prologue analysis
- we don't want to test it in random test-cases, where the intention is
  to check other functionality, which depends on prologue analysis.
  It is both inconvenient and insufficient.

If there is a problem with the prologue analysis, that may be due to a compiler
problem.  In another case, it maybe due to an architecture-specific specific
prologue analyzer.

I've been making test-cases less dependent on prologue analysis, to make
results more similar for different archs/compilers.

But we need to address the fact that this reduces testing of prologue analysis.

I came up with the idea of making a command maint check-prologue that iterates
over all the functions in an exec, calls both the architecture-specific
prologue analysis and the compiler-based prologue analysis and compares then,
and prints a line per function where there's a mismatch.

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