[PATCH] D152944: [BOLT] Mark sections read-only based on PT_GNU_RELRO segment

[Amir Ayupov via Phabricator via llvm-commits]

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Handle PT_GNU_RELRO segment in accordance with Linux Standard Base
chapter 12:

> PT_GNU_RELRO

The array element specifies the location and size of a segment which may
be made *read-only* after relocations have been processed.

Perform a readelf-style mapping check between this segment and sections,
mark sections as read-only.

Update gotpcrelx.s test as we start recognizing `jmp *foo at GOTPCREL(%rip)` as
fixed indirect jump and convert it to a tail call with `X86::JMP32m` opcode.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152944

Files:
  bolt/include/bolt/Core/BinarySection.h
  bolt/include/bolt/Rewrite/RewriteInstance.h
  bolt/lib/Rewrite/RewriteInstance.cpp
  bolt/test/X86/gotpcrelx.s
  bolt/test/X86/pt_gnu_relro.s

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