[llvm] [CodeGen] Add MachineRegisterClassInfo analysis pass (PR #210826)

[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/2162

<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/pipeline.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llc -mtriple=m68k -debug-pass=Structure < /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/pipeline.ll -o /dev/null 2>&1 | grep -v "Verify generated machine code" | /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/pipeline.ll
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llc -mtriple=m68k -debug-pass=Structure -o /dev/null
# executed command: grep -v 'Verify generated machine code'
# 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/pipeline.ll
# .---command stderr------------
# | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/pipeline.ll:79:15: error: CHECK-NEXT: is not on the line after the previous match
# | ; CHECK-NEXT: Machine code sinking
# |               ^
# | <stdin>:94:2: note: 'next' match was here
# |  Machine code sinking
# |  ^
# | <stdin>:92:29: note: previous match ended here
# |  Machine Cycle Info Analysis
# |                             ^
# | <stdin>:93:1: note: non-matching line after previous match is here
# |  Machine Register Class Info Analysis
# | ^
# | 
# | Input file: <stdin>
# | Check file: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/CodeGen/M68k/pipeline.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            .
# |            .
# |            .
# |           87:  Early Machine Loop Invariant Code Motion 
# |           88:  MachineDominator Tree Construction 
# |           89:  Machine Block Frequency Analysis 
# |           90:  Machine Common Subexpression Elimination 
# |           91:  MachinePostDominator Tree Construction 
# |           92:  Machine Cycle Info Analysis 
# | next:79'0                                {   search range start (exclusive)
# |           93:  Machine Register Class Info Analysis 
# |           94:  Machine code sinking 
# | next:79'1      !~~~~~~~~~~~~~~~~~~~   error: match on wrong line
# |           95:  Peephole Optimizations 
# |           96:  Remove dead machine instructions 
# |           97:  Detect Dead Lanes 
# |           98:  Init Undef Pass 
# |           99:  Process Implicit Definitions 
# |            .
...

```

</details>

https://github.com/llvm/llvm-project/pull/210826