[llvm] [GlobalISel] Combiner: Install Observer into MachineFunction (PR #102156)

[Tobias Stadler via llvm-commits]

https://github.com/tobias-stadler created https://github.com/llvm/llvm-project/pull/102156

The Combiner doesn't install the Observer into the MachineFunction.
This probably went unnoticed, because MachineFunction::getObserver() is
currently only used in constrainOperandRegClass(), but this might cause
issues down the line.


>From 90bb951a0a20ddaa7b304905a927272145f5bb92 Mon Sep 17 00:00:00 2001
From: Tobias Stadler <mail at stadler-tobias.de>
Date: Tue, 6 Aug 2024 17:05:54 +0200
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 1.3.6-bogner-wip
---
 llvm/lib/CodeGen/GlobalISel/Combiner.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/GlobalISel/Combiner.cpp b/llvm/lib/CodeGen/GlobalISel/Combiner.cpp
index 3310ce5455c97..5da9e86b20761 100644
--- a/llvm/lib/CodeGen/GlobalISel/Combiner.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Combiner.cpp
@@ -153,7 +153,7 @@ bool Combiner::combineMachineInstrs() {
     // down RPOT.
     Changed = false;
 
-    RAIIDelegateInstaller DelInstall(MF, ObserverWrapper.get());
+    RAIIMFObsDelInstaller DelInstall(MF, *ObserverWrapper);
     for (MachineBasicBlock *MBB : post_order(&MF)) {
       for (MachineInstr &CurMI :
            llvm::make_early_inc_range(llvm::reverse(*MBB))) {