[llvm] Revert "Add symbol visibility macros to abi-breaking.h.cmake" (PR #118464)

[Julian Nagele via llvm-commits]

https://github.com/juliannagele created https://github.com/llvm/llvm-project/pull/118464

Reverts llvm/llvm-project#110898

This change has caused a cyclic module dependency `fatal error: cyclic dependency in module 'LLVM_Utils': LLVM_Utils -> LLVM_Config_ABI_Breaking -> LLVM_Utils`. Reverting for now until we the right fix.

>From 4bac5f9cec8e73b14c5cfa0dd6d9c3656ea2cdd5 Mon Sep 17 00:00:00 2001
From: Julian Nagele <j.nagele at apple.com>
Date: Tue, 3 Dec 2024 10:24:06 +0000
Subject: [PATCH] Revert "Add symbol visibility macros to abi-breaking.h.cmake
 (#110898)"

This reverts commit 3be691651a2143f23bcf8f2704e55b01bbaa2550.
---
 llvm/include/llvm/Config/abi-breaking.h.cmake | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/llvm/include/llvm/Config/abi-breaking.h.cmake b/llvm/include/llvm/Config/abi-breaking.h.cmake
index 81495f0569752c..2d27e02b1d5457 100644
--- a/llvm/include/llvm/Config/abi-breaking.h.cmake
+++ b/llvm/include/llvm/Config/abi-breaking.h.cmake
@@ -12,8 +12,6 @@
 #ifndef LLVM_ABI_BREAKING_CHECKS_H
 #define LLVM_ABI_BREAKING_CHECKS_H
 
-#include "llvm/Support/Compiler.h"
-
 /* Define to enable checks that alter the LLVM C++ ABI */
 #cmakedefine01 LLVM_ENABLE_ABI_BREAKING_CHECKS
 
@@ -45,12 +43,12 @@
 #endif
 namespace llvm {
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
-LLVM_ABI extern int EnableABIBreakingChecks;
+extern int EnableABIBreakingChecks;
 LLVM_HIDDEN_VISIBILITY
 __attribute__((weak)) int *VerifyEnableABIBreakingChecks =
     &EnableABIBreakingChecks;
 #else
-LLVM_ABI extern int DisableABIBreakingChecks;
+extern int DisableABIBreakingChecks;
 LLVM_HIDDEN_VISIBILITY
 __attribute__((weak)) int *VerifyDisableABIBreakingChecks =
     &DisableABIBreakingChecks;