[Concurrency] NFC: Rename ImpliedByStandardProtocol to ImpliedByPreconcurrencyProtocol

The new name better reflects the intention for this Sendable check kind.

(cherry picked from commit 7cca722)

Author: xedin

lib/Sema/TypeCheckConcurrency.cpp

@@ -798,7 +798,7 @@ bool SendableCheckContext::warnInMinimalChecking() const {
   case SendableCheck::Explicit:
     return true;
 
-  case SendableCheck::ImpliedByStandardProtocol:
+  case SendableCheck::ImpliedByPreconcurrencyProtocol:
   case SendableCheck::Implicit:
   case SendableCheck::ImplicitForExternallyVisible:
     return false;

lib/Sema/TypeCheckConcurrency.h

@@ -352,7 +352,7 @@ enum class SendableCheck {
 
   /// Sendable conformance was implied by a protocol that inherits from
   /// Sendable and also predates concurrency.
-  ImpliedByStandardProtocol,
+  ImpliedByPreconcurrencyProtocol,
 
   /// Implicit conformance to Sendable.
   Implicit,
@@ -366,7 +366,7 @@ enum class SendableCheck {
 static inline bool isImplicitSendableCheck(SendableCheck check) {
   switch (check) {
   case SendableCheck::Explicit:
-  case SendableCheck::ImpliedByStandardProtocol:
+  case SendableCheck::ImpliedByPreconcurrencyProtocol:
     return false;
 
   case SendableCheck::Implicit:

lib/Sema/TypeCheckProtocol.cpp

@@ -6681,7 +6681,7 @@ void TypeChecker::checkConformancesInContext(IterableDeclContext *idc) {
   if (!hasDeprecatedUnsafeSendable && SendableConformance) {
     SendableCheck check = SendableCheck::Explicit;
     if (sendableConformancePreconcurrency)
-      check = SendableCheck::ImpliedByStandardProtocol;
+      check = SendableCheck::ImpliedByPreconcurrencyProtocol;
     else if (SendableConformance->getSourceKind() ==
                  ConformanceEntryKind::Synthesized)
       check = SendableCheck::Implicit;