#4034 sdcc crashes when compiling from standard input.

[Vladimir Setyaev]

sdcc version = 4.6.0 #16608 (Linux)
Run command: "cat any_code.c | sdcc -mstm8 --std=c2y --debug --out-fmt-elf --verbose --c1mode -o main.asm"
Expected: sdcc compile and created main.asm
Actual: sdcc: Generating code... Caught signal 11: SIGSEGV

But other command "cat any_code.c | sdcc -mstm8 --std=c2y --debug --verbose --c1mode -o main.asm" worked.