Implement DateIntervalFormatter.

(cherry picked from commit 988d5f8)

Add the new files to the `CMakeLists.txt`s.

(cherry picked from commit 0eed327)

Fix boundary styles outside of Darwin.

(cherry picked from commit ff070d6)

Guard the tests as well.

(cherry picked from commit 32cfcf1)

Make tests fuzzier so they work on both Darwin and Linux ICUs.

(cherry picked from commit b342e5f)

Better assertion failure messages in the fuzzy matching.

(cherry picked from commit 0c69d1a)

Even more info.

(cherry picked from commit e395327)

Actually fix all the missed copy-paste changes after fuzzification.

(cherry picked from commit 1600080)

Author: millenomi

CMakeLists.txt

@@ -382,6 +382,7 @@ if(ENABLE_TESTING)
                          TestFoundation/TestCodable.swift
                          TestFoundation/TestDateComponents.swift
                          TestFoundation/TestDateFormatter.swift
+                         TestFoundation/TestDateIntervalFormatter.swift
                          TestFoundation/TestDate.swift
                          TestFoundation/TestDecimal.swift
                          TestFoundation/TestEnergyFormatter.swift

CoreFoundation/Base.subproj/CFRuntime.c

@@ -213,6 +213,7 @@ static CFRuntimeClass const * __CFRuntimeClassTable[__CFRuntimeClassTableSize] _
     [_kCFRuntimeIDCFDateFormatter] = &__CFDateFormatterClass,
     [_kCFRuntimeIDCFNumberFormatter] = &__CFNumberFormatterClass,
     [_kCFRuntimeIDCFCalendar] = &__CFCalendarClass,
+    [_kCFRuntimeIDCFDateIntervalFormatter] = &__CFDateIntervalFormatterClass,
     [_kCFRuntimeIDCFDate] = &__CFDateClass,
     [_kCFRuntimeIDCFTimeZone] = &__CFTimeZoneClass,
     [_kCFRuntimeIDCFKeyedArchiverUID] = &__CFKeyedArchiverUIDClass,

CoreFoundation/Base.subproj/CFRuntime_Internal.h

@@ -76,6 +76,7 @@ enum {
     _kCFRuntimeIDCFSocket = 61,
     _kCFRuntimeIDCFAttributedString = 62,
     _kCFRuntimeIDCFRunArray = 63,
+    _kCFRuntimeIDCFDateIntervalFormatter = 64,
     // If you are adding a new value, it goes below this line.
 
     // Stuff not in CF goes here. This value should be one more than the last one above.
@@ -124,7 +125,6 @@ CF_PRIVATE const CFRuntimeClass __CFPreferencesDomainClass;
 
 CF_PRIVATE const CFRuntimeClass __CFMachPortClass;
 
-
 #if (TARGET_OS_MAC || TARGET_OS_WIN32 || DEPLOYMENT_RUNTIME_SWIFT)
 CF_PRIVATE const CFRuntimeClass __CFMessagePortClass;
 #endif
@@ -143,6 +143,7 @@ CF_PRIVATE const CFRuntimeClass __CFWindowsNamedPipeClass;
 #endif
 CF_PRIVATE const CFRuntimeClass __CFTimeZoneClass;
 CF_PRIVATE const CFRuntimeClass __CFCalendarClass;
+CF_PRIVATE const CFRuntimeClass __CFDateIntervalFormatterClass;
 
 #pragma mark - Private initialiers to run at process start time
 

CoreFoundation/Base.subproj/ForSwiftFoundationOnly.h

@@ -24,6 +24,7 @@
 #include <CoreFoundation/CFRegularExpression.h>
 #include <CoreFoundation/CFLogUtilities.h>
 #include <CoreFoundation/CFURLSessionInterface.h>
+#include <CoreFoundation/CFDateIntervalFormatter.h>
 #include <CoreFoundation/ForFoundationOnly.h>
 #if DEPLOYMENT_TARGET_WINDOWS
 #define NOMINMAX

CoreFoundation/CMakeLists.txt

@@ -78,6 +78,7 @@ add_framework(CoreFoundation
                 Locale.subproj/CFCalendar_Internal.h
                 Locale.subproj/CFDateComponents.h
                 Locale.subproj/CFDateFormatter_Private.h
+                Locale.subproj/CFDateIntervalFormatter.h
                 Locale.subproj/CFDateInterval.h
                 Locale.subproj/CFICULogging.h
                 Locale.subproj/CFLocaleInternal.h
@@ -144,6 +145,7 @@ add_framework(CoreFoundation
                 StringEncodings.subproj/CFStringEncodingConverterExt.h
                 URL.subproj/CFURLPriv.h
                 URL.subproj/CFURLSessionInterface.h
+                Locale.subproj/CFDateIntervalFormatter.h
 
                 # AppServices
                 AppServices.subproj/CFNotificationCenter.h
@@ -232,6 +234,7 @@ add_framework(CoreFoundation
                 Locale.subproj/CFCalendar_Enumerate.c
                 Locale.subproj/CFDateComponents.c
                 Locale.subproj/CFDateFormatter.c
+                Locale.subproj/CFDateIntervalFormatter.c
                 Locale.subproj/CFDateInterval.c
                 Locale.subproj/CFLocale.c
                 Locale.subproj/CFLocaleIdentifier.c