[lld] [LLD][ELF] add bp-* options in ELF (PR #120514)

[Fangrui Song via llvm-commits]

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+# REQUIRES: aarch64
+
+## Generate a large test case and check that the output is deterministic.
+
+# RUN: %python %s %t.s %t.proftext
+
+# RUN: llvm-mc -filetype=obj -triple=aarch64 %t.s -o %t.o
+# RUN: llvm-profdata merge %t.proftext -o %t.profdata
+
+# RUN: ld.lld --icf=all -o - %t.o --irpgo-profile=%t.profdata --bp-startup-sort=function --bp-compression-sort-startup-functions --bp-compression-sort=both | llvm-nm --numeric-sort --format=just-symbols - > %t.order1.txt
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MaskRay wrote:

Use a stronger check (output is same): `-o %t1.o` and `-o %t2.o` and `cmp %t1.o %t2.o`

https://github.com/llvm/llvm-project/pull/120514