[llvm] [NVPTX] Add Volta Load/Store Atomics (.relaxed, .acquire, .release) and Volatile (.mmio/.volatile) support (PR #98022)

[Artem Belevich via llvm-commits]

Artem-B wrote:

Looks like the patch is causing crashes for us. We need to revert it.

```
LLVM ERROR: PTX does not support "atomic" for orderings different than"NotAtomic" or "Monotonic" for sm_60 or older, but order is: "unordered".
*** SIGABRT received by PID 7982 (TID 7982) on cpu 1 from PID 7982; stack trace: ***
PC: @     0x7efc5b22a981  (unknown)  gsignal
    @     0x7ef78de77706       1904  FailureSignalHandler()
    @     0x7efc65005e80  710448744  (unknown)
    @     0x7efc5b22a981        136  gsignal
    @     0x7efc5b22bdf7        304  abort
    @     0x7efaedf4b525        208  llvm::report_fatal_error()
    @     0x7efaedf4b561         64  llvm::report_fatal_error()
    @     0x7efb11bdfee2        416  getCodeMemorySemantic()
    @     0x7efb11bd6f9e        432  llvm::NVPTXDAGToDAGISel::tryStore()
    @     0x7efb11bd5f51         32  llvm::NVPTXDAGToDAGISel::Select()
    @     0x7efb0ff7b421        288  llvm::SelectionDAGISel::DoInstructionSelection()
    @     0x7efb0ff7a1fb        640  llvm::SelectionDAGISel::CodeGenAndEmitDAG()
    @     0x7efb0ff7786d        784  llvm::SelectionDAGISel::SelectAllBasicBlocks()
    @     0x7efb0ff74b7d        208  llvm::SelectionDAGISel::runOnMachineFunction()
    @     0x7efb0ff726c6         64  llvm::SelectionDAGISelLegacy::runOnMachineFunction()
    @     0x7efb0faca810        976  llvm::MachineFunctionPass::runOnFunction()
```

I will extract the reproducer a bit later.

https://github.com/llvm/llvm-project/pull/98022