[lld][test] Fix sanitizer buildbot failure

Buildbot failure:
https://lab.llvm.org/buildbot/#/builders/5/builds/41530/steps/9/logs/stdio

Author: SixWeining

lld/test/ELF/loongarch-reloc-leb128.s

@@ -99,4 +99,4 @@ w2:
 .reloc ., R_LARCH_ADD_ULEB128, w2
 .reloc ., R_LARCH_SUB_ULEB128, w1
 .fill 10, 1, 0x80
-.byte 0
+.byte 1