[AST] NFC: Inline isActuallyCanonicalOrNull()

This is on the very hot path for Release+Assert builds.

Author: davezarzycki

include/swift/AST/Types.h

@@ -5262,7 +5262,13 @@ inline CanType CanType::getWithoutSpecifierTypeImpl(CanType type) {
 inline CanType CanType::getNominalParent() const {
   return cast<NominalOrBoundGenericNominalType>(*this).getParent();
 }
-  
+
+inline bool CanType::isActuallyCanonicalOrNull() const {
+  return getPointer() == nullptr ||
+         getPointer() == llvm::DenseMapInfo<TypeBase *>::getTombstoneKey() ||
+         getPointer()->isCanonical();
+}
+
 inline Type TupleTypeElt::getVarargBaseTy() const {
   TypeBase *T = getType().getPointer();
   if (auto *AT = dyn_cast<ArraySliceType>(T))

lib/AST/Type.cpp

@@ -102,12 +102,6 @@ void *TypeBase::operator new(size_t bytes, const ASTContext &ctx,
   return ctx.Allocate(bytes, alignment, arena);
 }
 
-bool CanType::isActuallyCanonicalOrNull() const {
-  return getPointer() == nullptr ||
-         getPointer() == llvm::DenseMapInfo<TypeBase *>::getTombstoneKey() ||
-         getPointer()->isCanonical();
-}
-
 NominalTypeDecl *CanType::getAnyNominal() const {
   return dyn_cast_or_null<NominalTypeDecl>(getAnyGeneric());
 }