Introduce isType and getDeclType

Accidentally forgot a negation

address review notes

Address more of Jordan's feedback

Author: Azoy

include/swift/AST/ASTContext.h

@@ -460,7 +460,10 @@ class ASTContext final {
 
 #define KNOWN_STDLIB_TYPE_DECL(NAME, DECL_CLASS, NUM_GENERIC_PARAMS) \
   /** Retrieve the declaration of Swift.NAME. */ \
-  DECL_CLASS *get##NAME##Decl() const;
+  DECL_CLASS *get##NAME##Decl() const; \
+\
+  /** Retrieve the type of Swift.NAME. */ \
+  Type get##NAME##Type() const;
 #include "swift/AST/KnownStdlibTypes.def"
 
   /// Retrieve the declaration of Swift.Optional<T>.Some.
@@ -475,9 +478,6 @@ class ASTContext final {
   /// Retrieve the type Swift.AnyObject.
   CanType getAnyObjectType() const;
 
-  /// Retrieve the type Swift.Never.
-  CanType getNeverType() const;
-
 #define KNOWN_OBJC_TYPE_DECL(MODULE, NAME, DECL_CLASS) \
   /** Retrieve the declaration of MODULE.NAME. */ \
   DECL_CLASS *get##NAME##Decl() const; \

include/swift/AST/KnownProtocols.def

@@ -70,6 +70,7 @@ PROTOCOL(OptionSet)
 PROTOCOL(CaseIterable)
 PROTOCOL(SIMDScalar)
 PROTOCOL(BinaryInteger)
+PROTOCOL(RangeReplaceableCollection)
 
 PROTOCOL_(BridgedNSError)
 PROTOCOL_(BridgedStoredNSError)