Revert "[NVPTX] Add Volta Load/Store Atomics (.relaxed, .acquire, .release) and Volatile (.mmio/.volatile) support" (#99695)

Reverts #98022

Author: slackito

llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp

@@ -227,33 +227,9 @@ void NVPTXInstPrinter::printLdStCode(const MCInst *MI, int OpNum,
   if (Modifier) {
     const MCOperand &MO = MI->getOperand(OpNum);
     int Imm = (int) MO.getImm();
-    if (!strcmp(Modifier, "sem")) {
-      switch (Imm) {
-      case NVPTX::PTXLdStInstCode::NotAtomic:
-        break;
-      case NVPTX::PTXLdStInstCode::Volatile:
+    if (!strcmp(Modifier, "volatile")) {
+      if (Imm)
         O << ".volatile";
-        break;
-      case NVPTX::PTXLdStInstCode::Relaxed:
-        O << ".relaxed.sys";
-        break;
-      case NVPTX::PTXLdStInstCode::Acquire:
-        O << ".acquire.sys";
-        break;
-      case NVPTX::PTXLdStInstCode::Release:
-        O << ".release.sys";
-        break;
-      case NVPTX::PTXLdStInstCode::RelaxedMMIO:
-        O << ".mmio.relaxed.sys";
-        break;
-      default:
-        SmallString<256> Msg;
-        raw_svector_ostream OS(Msg);
-        OS << "NVPTX LdStCode Printer does not support \"" << Imm
-           << "\" sem modifier.";
-        report_fatal_error(OS.str());
-        break;
-      }
     } else if (!strcmp(Modifier, "addsp")) {
       switch (Imm) {
       case NVPTX::PTXLdStInstCode::GLOBAL:

llvm/lib/Target/NVPTX/NVPTX.h

@@ -107,14 +107,6 @@ enum LoadStore {
 };
 
 namespace PTXLdStInstCode {
-enum MemorySemantic {
-  NotAtomic = 0, // PTX calls these: "Weak"
-  Volatile = 1,
-  Relaxed = 2,
-  Acquire = 3,
-  Release = 4,
-  RelaxedMMIO = 5
-};
 enum AddressSpace {
   GENERIC = 0,
   GLOBAL = 1,