[Bug ld/32297] sframe: bfd assertion with empty main on IBT enabled system

[indu.bhagat at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=32297

--- Comment #1 from Indu Bhagat <indu.bhagat at oracle dot com> ---
A hand-crafted reproducer:

$ cat bar.c 
void foo();
unsigned long var;
void test () {
  var = (unsigned long)foo;
  foo ();
}

$ cat foo.s 
.globl foo
foo:
.section        .note.GNU-stack,"",@progbits

$ gcc -O2 -Wa,--gsframe -fPIC -c -o bar.o bar.c

$ gcc -O2 -Wa,--gsframe -fPIC -S bar.c

$ ld -shared -z ibtplt -o pltsec.so foo.o bar.o
ld: BFD (GNU Binutils) 2.43.50.20241016 assertion fail
/scratch/ibhagat/BINUTILS-GDB/binutils-gdb/binutils-gdb/bfd/elfxx-x86.c:1990
make: *** [Makefile:23: pltsec.so] Error 1

The above is on trunk, hence a different line number.

The issue seems to be that the implementation in ld has incorrect conditionals
for checking the presence of a .plt.sec, when writing out SFrame for it.  As in
the reproducer above, in absence of a .plt.sec, bfd triggers an assertion.

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