[clang] [llvm] [CodeGen] Assign SHT_LLVM_LTO to .llvm.lto section (PR #92856)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay created https://github.com/llvm/llvm-project/pull/92856

This follows up to SHT_LLVM_LTO (https://reviews.llvm.org/D153215) and
resolves the comment of the FatLTO patch
https://reviews.llvm.org/D146776#4430626


>From fdf70f50de2d51223f3f04b2db4913360ded3469 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i at maskray.me>
Date: Mon, 20 May 2024 22:08:41 -0700
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.5-bogner
---
 clang/test/CodeGen/fat-lto-objects.c              | 2 +-
 llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 2 ++
 llvm/test/CodeGen/X86/fat-lto-section.ll          | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/clang/test/CodeGen/fat-lto-objects.c b/clang/test/CodeGen/fat-lto-objects.c
index b50567c024fc8..36a73684e7bfe 100644
--- a/clang/test/CodeGen/fat-lto-objects.c
+++ b/clang/test/CodeGen/fat-lto-objects.c
@@ -62,7 +62,7 @@
 
 // ELF: .llvm.lto
 
-//      ASM: .section        .llvm.lto,"e", at progbits
+//      ASM: .section        .llvm.lto,"e", at llvm_lto
 // ASM-NEXT: .Lllvm.embedded.object:
 // ASM-NEXT:        .asciz  "BC
 // ASM-NEXT: .size   .Lllvm.embedded.object
diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 3e1897ce670a6..0fc915d89f6c0 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -523,6 +523,8 @@ static unsigned getELFSectionType(StringRef Name, SectionKind K) {
 
   if (hasPrefix(Name, ".llvm.offloading"))
     return ELF::SHT_LLVM_OFFLOADING;
+  if (Name == ".llvm.lto")
+    return ELF::SHT_LLVM_LTO;
 
   if (K.isBSS() || K.isThreadBSS())
     return ELF::SHT_NOBITS;
diff --git a/llvm/test/CodeGen/X86/fat-lto-section.ll b/llvm/test/CodeGen/X86/fat-lto-section.ll
index 30c56229a0e2a..f3ca8436affb4 100644
--- a/llvm/test/CodeGen/X86/fat-lto-section.ll
+++ b/llvm/test/CodeGen/X86/fat-lto-section.ll
@@ -5,6 +5,6 @@
 ; RUN:   | FileCheck %s --check-prefix=EXCLUDE
 
 ; EXCLUDE: Name               Type     {{.*}} ES Flg Lk Inf Al
-; EXCLUDE: .llvm.lto          PROGBITS {{.*}} 00   E  0   0  1
+; EXCLUDE: .llvm.lto          LLVM_LTO {{.*}} 00   E  0   0  1
 
 @a = global i32 1