[RISCV] The asm parser does not error on incorrectly spelt @plt on call symbols

[svs-quic]

The asm parser currently parsers something like call symbol@rlt without any error and produces an empty object file. It would be better if we error out in such scenarios.

cat plt.s
tail foo@rlt

bin/llvm-mc --filetype=obj plt.s  -triple riscv32 -o plt.o

bin/llvm-objdump -d plt.o

plt.o:	file format elf32-littleriscv

[llvmbot]

@llvm/issue-subscribers-backend-risc-v

Author: Sudharsan Veeravalli (svs-quic)

The asm parser currently parsers something like `call symbol@rlt` without any error and produces an empty object file. It would be better if we error out in such scenarios.

cat plt.s
tail foo@<!-- -->rlt

bin/llvm-mc --filetype=obj plt.s  -triple riscv32 -o plt.o

bin/llvm-objdump -d plt.o

plt.o:	file format elf32-littleriscv

[svs-quic]

This issue has been fixed by #135509