MC: Remove redundant relocations for label differences For the label difference A-B where A and B are in the same section, if the section contains no linker-relaxable instruction, we can disable the framnent walk code path (https://reviews.llvm.org/D155357), removing redundant relocations. This optimization is available since we now track per-section linker-relaxable instructions (#140692). lld/test/ELF/loongarch-reloc-leb128.s , introduced in #81133, has been updated in 9662a6039c0320eb4473d87b47f0ed891a0f111c to prevent coverage loss.
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