[llvm] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

1 files changed, 10 insertions, 10 deletions

diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 70f1ccb..0ac42a4 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -783,7 +783,7 @@ bool LLParser::parseMDNodeID(MDNode *&Result) {
 
   // Otherwise, create MDNode forward reference.
   auto &FwdRef = ForwardRefMDNodes[MID];
-  FwdRef = std::make_pair(MDTuple::getTemporary(Context, None), IDLoc);
+  FwdRef = std::make_pair(MDTuple::getTemporary(Context, std::nullopt), IDLoc);
 
   Result = FwdRef.first.get();
   NumberedMetadata[MID].reset(Result);
@@ -2132,7 +2132,7 @@ bool LLParser::parseOptionalFunctionMetadata(Function &F) {
 ///   ::= /* empty */
 ///   ::= 'align' 4
 bool LLParser::parseOptionalAlignment(MaybeAlign &Alignment, bool AllowParens) {
-  Alignment = None;
+  Alignment = std::nullopt;
   if (!EatIfPresent(lltok::kw_align))
     return false;
   LocTy AlignLoc = Lex.getLoc();
@@ -2244,7 +2244,7 @@ static Optional<MemoryEffects::Location> keywordToLoc(lltok::Kind Tok) {
   case lltok::kw_inaccessiblemem:
     return MemoryEffects::InaccessibleMem;
   default:
-    return None;
+    return std::nullopt;
   }
 }
 
@@ -2259,7 +2259,7 @@ static Optional<ModRefInfo> keywordToModRef(lltok::Kind Tok) {
   case lltok::kw_readwrite:
     return ModRefInfo::ModRef;
   default:
-    return None;
+    return std::nullopt;
   }
 }
 
@@ -2274,7 +2274,7 @@ Optional<MemoryEffects> LLParser::parseMemoryAttr() {
   Lex.Lex();
   if (!EatIfPresent(lltok::lparen)) {
     tokError("expected '('");
-    return None;
+    return std::nullopt;
   }
 
   bool SeenLoc = false;
@@ -2284,7 +2284,7 @@ Optional<MemoryEffects> LLParser::parseMemoryAttr() {
       Lex.Lex();
       if (!EatIfPresent(lltok::colon)) {
         tokError("expected ':' after location");
-        return None;
+        return std::nullopt;
       }
     }
 
@@ -2295,7 +2295,7 @@ Optional<MemoryEffects> LLParser::parseMemoryAttr() {
                  "or access kind (none, read, write, readwrite)");
       else
         tokError("expected access kind (none, read, write, readwrite)");
-      return None;
+      return std::nullopt;
     }
 
     Lex.Lex();
@@ -2305,7 +2305,7 @@ Optional<MemoryEffects> LLParser::parseMemoryAttr() {
     } else {
       if (SeenLoc) {
         tokError("default access kind must be specified first");
-        return None;
+        return std::nullopt;
       }
       ME = MemoryEffects(*MR);
     }
@@ -2315,7 +2315,7 @@ Optional<MemoryEffects> LLParser::parseMemoryAttr() {
   } while (EatIfPresent(lltok::comma));
 
   tokError("unterminated memory attribute");
-  return None;
+  return std::nullopt;
 }
 
 /// parseOptionalCommaAlign
@@ -2392,7 +2392,7 @@ bool LLParser::parseAllocSizeArguments(unsigned &BaseSizeArg,
                    "'allocsize' indices can't refer to the same parameter");
     HowManyArg = HowMany;
   } else
-    HowManyArg = None;
+    HowManyArg = std::nullopt;
 
   auto EndParen = Lex.getLoc();
   if (!EatIfPresent(lltok::rparen))