[llvm] Reland "[amdgpu] Add llvm.amdgcn.init.whole.wave intrinsic" (#108054)" (PR #108173)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-x86_64-debian-dylib` running on `gribozavr4` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/60/builds/7370

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

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/AMDGPU/si-init-whole-wave.mir' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
RUN: at line 2: /b/1/llvm-x86_64-debian-dylib/build/bin/llc -mtriple=amdgcn -mcpu=gfx1200 -verify-machineinstrs -run-pass si-wqm -o -  /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/AMDGPU/si-init-whole-wave.mir | /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/AMDGPU/si-init-whole-wave.mir
+ /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/AMDGPU/si-init-whole-wave.mir
+ /b/1/llvm-x86_64-debian-dylib/build/bin/llc -mtriple=amdgcn -mcpu=gfx1200 -verify-machineinstrs -run-pass si-wqm -o - /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/AMDGPU/si-init-whole-wave.mir
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /b/1/llvm-x86_64-debian-dylib/build/bin/llc -mtriple=amdgcn -mcpu=gfx1200 -verify-machineinstrs -run-pass si-wqm -o - /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/AMDGPU/si-init-whole-wave.mir
 #0 0x00007fe9bbad2777 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/b/1/llvm-x86_64-debian-dylib/build/lib/libLLVM.so.20.0git+0xeba777)
 #1 0x00007fe9bbad022e llvm::sys::RunSignalHandlers() (/b/1/llvm-x86_64-debian-dylib/build/lib/libLLVM.so.20.0git+0xeb822e)
 #2 0x00007fe9bbad2e4f SignalHandler(int) Signals.cpp:0:0
 #3 0x00007fe9bac02140 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x13140)
 #4 0x00007fe9be8beca9 llvm::SIInstrInfo::fixImplicitOperands(llvm::MachineInstr&) const crtstuff.c:0:0
 #5 0x00007fe9be8322bd llvm::GCNSubtarget::mirFileLoaded(llvm::MachineFunction&) const crtstuff.c:0:0
 #6 0x00007fe9bc78aa2f llvm::MIRParserImpl::initializeMachineFunction(llvm::yaml::MachineFunction const&, llvm::MachineFunction&) (/b/1/llvm-x86_64-debian-dylib/build/lib/libLLVM.so.20.0git+0x1b72a2f)
 #7 0x00007fe9bc789c42 llvm::MIRParserImpl::parseMachineFunction(llvm::Module&, llvm::MachineModuleInfo&, llvm::AnalysisManager<llvm::Module>*) (/b/1/llvm-x86_64-debian-dylib/build/lib/libLLVM.so.20.0git+0x1b71c42)
 #8 0x00007fe9bc7901e0 llvm::MIRParser::parseMachineFunctions(llvm::Module&, llvm::MachineModuleInfo&) (/b/1/llvm-x86_64-debian-dylib/build/lib/libLLVM.so.20.0git+0x1b781e0)
 #9 0x0000000000412672 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#10 0x000000000040fc9d main (/b/1/llvm-x86_64-debian-dylib/build/bin/llc+0x40fc9d)
#11 0x00007fe9ba713d7a __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x23d7a)
#12 0x000000000040eada _start (/b/1/llvm-x86_64-debian-dylib/build/bin/llc+0x40eada)
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/AMDGPU/si-init-whole-wave.mir

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/108173