bug#42657: emacs-27.1-rc1 and Asan findings

[Jeffrey Walton]

I don't have log files for Asan testing. The process is killed before
the log file gets written.

I think just about every test failed similar to:

=================================================================
==18430==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 16 byte(s) in 1 object(s) allocated from:
    #0 0x7f4408236d28 in __interceptor_calloc
(/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    #1 0x56126c6f40a5 in dump_mmap_contiguous_heap
/home/jwalton/Build-Scripts/emacs-27.1/src/pdumper.c:4684
    #2 0x56126c6f40a5 in dump_mmap_contiguous
/home/jwalton/Build-Scripts/emacs-27.1/src/pdumper.c:4868
    #3 0x56126c6f40a5 in pdumper_load
/home/jwalton/Build-Scripts/emacs-27.1/src/pdumper.c:5428
    #4 0x56126c47e1d2 in load_pdump
/home/jwalton/Build-Scripts/emacs-27.1/src/emacs.c:853
    #5 0x56126c47e1d2 in main
/home/jwalton/Build-Scripts/emacs-27.1/src/emacs.c:1062
    #6 0x7f4406512b96 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

SUMMARY: AddressSanitizer: 16 byte(s) leaked in 1 allocation(s).