[llvm] [NewPM][Instrumentation] Support `MachineOptimizationRemarkEmitter` (PR #90563)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,44 @@
+# REQUIRES: x86-registered-target
+
+# RUN: llc -mtriple=x86_64-unknown-linux-gnu -filetype=null %s \
+# RUN: -p dead-mi-elimination -pass-remarks-analysis='size-info' \
+# RUN: -pass-remarks-output=%t.yaml < %s 2> %t; \
+# RUN: cat %t %t.yaml | FileCheck %s
+
+--- |
+  source_filename = "size-remark-emitter.mir"
+  target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
+  target triple = "x86_64-unknown-linux-gnu"
----------------
arsenm wrote:

Don't need the triple / DL. source_filename maybe interesting for including it in the message 

https://github.com/llvm/llvm-project/pull/90563