[llvm] [GlobalISel] Remove LegacyLegalizerInfo (PR #197308)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/1214

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: CodeGen/M68k/GlobalISel/legalize-add.mir' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 2
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llc -mtriple=m68k -run-pass=legalizer -verify-machineinstrs /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/GlobalISel/legalize-add.mir -o - | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/GlobalISel/legalize-add.mir
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llc -mtriple=m68k -run-pass=legalizer -verify-machineinstrs /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/GlobalISel/legalize-add.mir -o -
# .---command stderr------------
# | LLVM ERROR: unable to legalize instruction: %8:_(s8) = G_TRUNC %1:_(s32) (in function: test_scalar_small)
# `-----------------------------
# error: command failed with exit status: 1
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/GlobalISel/legalize-add.mir
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/GlobalISel/legalize-add.mir
# `-----------------------------
# error: command failed with exit status: 2

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/197308