lld produces elf with corrupt string table index

[stsp]

lld-tst.tar.gz
This is a fully automated test-case.
Just run:

$ ./test.sh
ld.lld -melf_i386 -static -o a.elf --defsym=loadaddr=0x900 -Tkernel.ld kernel.o entry.o io.o console.o serial.o printer.o execrh.o nlssupt.o procsupt.o dosidle.o int2f.o nls_hc.o intr.o irqstack.o cpu.o plt.o cdata.o floppy.o rdpcclk.o wrpcclk.o wratclk.o
nm: warning: a.elf has a corrupt string table index

The "good" run can be achieved
with: LD=ld ./test.sh.
In this case it uses GNU ld, and
nm just prints a symbol table.

[stsp]

Tested on lld from 17 to 20.
Also note that I removed RELC
and any other fancy stuff that
was in my previous test-case,
so this sample is rather basic.

[llvmbot]

@llvm/issue-subscribers-lld-elf

Author: Stas Sergeev (stsp)

[lld-tst.tar.gz](https://github.com/user-attachments/files/21052616/lld-tst.tar.gz) This is a fully automated test-case. Just run: ``` $ ./test.sh ld.lld -melf_i386 -static -o a.elf --defsym=loadaddr=0x900 -Tkernel.ld kernel.o entry.o io.o console.o serial.o printer.o execrh.o nlssupt.o procsupt.o dosidle.o int2f.o nls_hc.o intr.o irqstack.o cpu.o plt.o cdata.o floppy.o rdpcclk.o wrpcclk.o wratclk.o nm: warning: a.elf has a corrupt string table index ```

The "good" run can be achieved
with: LD=ld ./test.sh.
In this case it uses GNU ld, and
nm just prints a symbol table.