Tail merging removes the lines from DWARF line program

[zhihaoy]

Godbolt https://godbolt.org/z/9bxdxccn4

llvm-dwarfdump --debug-line o3.txt

#65667 may be related. But in this case, there exist instructions to prepare for different arguments before reaching the call, can line entries point to those instructions?

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: None (zhihaoy)

Godbolt https://godbolt.org/z/9bxdxccn4

llvm-dwarfdump --debug-line o3.txt

#65667 may be related. But in this case, there exist instructions to prepare for different arguments before reaching the call, can line entries point to those instructions?