[llvm] [CodeGen] Move rollback capabilities outside of the rematerializer (PR #184341)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/CodeGen/Rematerializer.h llvm/lib/CodeGen/Rematerializer.cpp llvm/unittests/CodeGen/RematerializerTest.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/unittests/CodeGen/RematerializerTest.cpp b/llvm/unittests/CodeGen/RematerializerTest.cpp
index 40e53febb..6b1373377 100644
--- a/llvm/unittests/CodeGen/RematerializerTest.cpp
+++ b/llvm/unittests/CodeGen/RematerializerTest.cpp
@@ -678,8 +678,9 @@ body:             |
   EXPECT_TRUE(getMF().verify());
 }
 
-/// Checks that rollback re-creates MIs at correct positions when the order of register deletions
-/// forces the re-creation logic to iterate through multiple deleted registers' respective insert position to find a valid one.
+/// Checks that rollback re-creates MIs at correct positions when the order of
+/// register deletions forces the re-creation logic to iterate through multiple
+/// deleted registers' respective insert position to find a valid one.
 TEST_F(RematerializerTest, RollbackInvalidInsertPos) {
   StringRef MIR = R"(
 name:            RollbackInvalidInsertPos

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https://github.com/llvm/llvm-project/pull/184341