[LLD][ELF] Don't spill to same memory region (#129795)

This prevents useless spills to the same memory region from causing
spilling to take too many passes to converge.

Handling this at spilling time allows us to relax the generation of
spill sections; specifically, multiple spills can now be generated per
output section. This should be fairly benign for performance, and it
would eventually allow linker scripts to express things like holes or
minimum addresses for parts of output sections. The linker could then
spill within an output section whenever address constraints are
violated.

0 files changed, 0 insertions, 0 deletions