[lld] [lld][ELF] Introduce an option to keep data section prefix. (PR #148985)

[Mingming Liu via llvm-commits]

================
@@ -87,3 +150,60 @@ _start:
 
 .section .bss, "aw"
 .space 1
+
+#--- b.s
+.globl _start
+_start:
+  ret
+
+.section .bss.a,"aw"
+  .byte 0
+.section .bss.hot.b,"aw"
+  .byte 0
+.section .bss.unlikely.c,"aw"
+  .byte 0
+.section .bss.split.d,"aw"
+  .byte 0
+
+.section .bss.rel.ro, "aw"
+  .space 2
+.section .bss.rel.ro, "aw"
----------------
mingmingl-llvm wrote:

ah the 4 `.bss.rel.ro` sections used to have different names.  Given the discussion in https://github.com/llvm/llvm-project/pull/148985#discussion_r2221107339, only one section without any prefix should be kept. 

https://github.com/llvm/llvm-project/pull/148985