[AMDGPU][AsmParser][NFC] Eliminate Match_PreferE32. (#92159)

Was added in 88e0b25 and is unused
since fcef407.

Author: kosarev

llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp

@@ -1388,9 +1388,6 @@ class AMDGPUAsmParser : public MCTargetAsmParser {
                     bool IsAtomic);
 
 public:
-  enum AMDGPUMatchResultTy {
-    Match_PreferE32 = FIRST_TARGET_MATCH_RESULT_TY
-  };
   enum OperandMode {
     OperandMode_Default,
     OperandMode_NSA,
@@ -5262,15 +5259,11 @@ bool AMDGPUAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                                   Variant);
     // We order match statuses from least to most specific. We use most specific
     // status as resulting
-    // Match_MnemonicFail < Match_InvalidOperand < Match_MissingFeature < Match_PreferE32
-    if ((R == Match_Success) ||
-        (R == Match_PreferE32) ||
-        (R == Match_MissingFeature && Result != Match_PreferE32) ||
-        (R == Match_InvalidOperand && Result != Match_MissingFeature
-                                   && Result != Match_PreferE32) ||
-        (R == Match_MnemonicFail   && Result != Match_InvalidOperand
-                                   && Result != Match_MissingFeature
-                                   && Result != Match_PreferE32)) {
+    // Match_MnemonicFail < Match_InvalidOperand < Match_MissingFeature
+    if (R == Match_Success || R == Match_MissingFeature ||
+        (R == Match_InvalidOperand && Result != Match_MissingFeature) ||
+        (R == Match_MnemonicFail && Result != Match_InvalidOperand &&
+         Result != Match_MissingFeature)) {
       Result = R;
       ErrorInfo = EI;
     }
@@ -5316,9 +5309,6 @@ bool AMDGPUAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
     return Error(ErrorLoc, "invalid operand for instruction");
   }
 
-  case Match_PreferE32:
-    return Error(IDLoc, "internal error: instruction without _e64 suffix "
-                        "should be encoded as e32");
   case Match_MnemonicFail:
     llvm_unreachable("Invalid instructions should have been handled already");
   }