cmd/link: TestELFHeadersSorted/exe failures

#!watchflakes
default <- pkg == "cmd/link" && test == "TestELFHeadersSorted/exe"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestELFHeadersSorted/exe
=== PAUSE TestELFHeadersSorted/exe
=== CONT  TestELFHeadersSorted/exe
    elf_test.go:711: build failed: exit status 1, output:
        # command-line-arguments
        SIGSEGV: segmentation violation
        PC=0x20ffe m=1 sigcode=1 addr=0x0
        
        goroutine 0 gp=0x271859414540 m=1 mp=0x271859456008 [idle]:
        internal/runtime/syscall/linux.Syscall6()
...
        a5  0x0	a6  0x0
        a7  0x16	s2  0x271859439f08
        s3  0x271859456008	s4  0x271859458000
        s5  0x4401141	s6  0xffffffff89cfd92b
        s7  0x6c4e146	s8  0x5eacf33d
        s9  0xbfaff37f	s10 0x7fb530
        s11 0x271859414540	t3  0x8ad11452e5da
        t4  0xffffffffffffffff	t5  0x3d5ad104832
        t6  0x27185943a6a8	pc  0x20ffe
--- FAIL: TestELFHeadersSorted/exe (0.36s)

— watchflakes