LibJS+LibWeb: Replace GlobalObject with Realm in Heap::allocate<T>()

This is a continuation of the previous three commits.

Now that create() receives the allocating realm, we can simply forward
that to allocate(), which accounts for the majority of these changes.
Additionally, we can get rid of the realm_from_global_object() in one
place, with one more remaining in VM::throw_completion().

Userland/Libraries/LibJS/Runtime/Intl/CollatorCompareFunction.cpp

@@ -13,7 +13,7 @@ namespace JS::Intl {
 
 CollatorCompareFunction* CollatorCompareFunction::create(Realm& realm, Collator& collator)
 {
-    return realm.heap().allocate<CollatorCompareFunction>(realm.global_object(), realm, collator);
+    return realm.heap().allocate<CollatorCompareFunction>(realm, realm, collator);
 }
 
 CollatorCompareFunction::CollatorCompareFunction(Realm& realm, Collator& collator)

Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormatFunction.cpp

@@ -16,7 +16,7 @@ namespace JS::Intl {
 // 11.5.5 DateTime Format Functions, https://tc39.es/ecma402/#sec-datetime-format-functions
 DateTimeFormatFunction* DateTimeFormatFunction::create(Realm& realm, DateTimeFormat& date_time_format)
 {
-    return realm.heap().allocate<DateTimeFormatFunction>(realm.global_object(), date_time_format, *realm.global_object().function_prototype());
+    return realm.heap().allocate<DateTimeFormatFunction>(realm, date_time_format, *realm.global_object().function_prototype());
 }
 
 DateTimeFormatFunction::DateTimeFormatFunction(DateTimeFormat& date_time_format, Object& prototype)

Userland/Libraries/LibJS/Runtime/Intl/Locale.cpp

@@ -16,7 +16,7 @@ namespace JS::Intl {
 
 Locale* Locale::create(Realm& realm, Unicode::LocaleID const& locale_id)
 {
-    return realm.heap().allocate<Locale>(realm.global_object(), locale_id, *realm.global_object().intl_locale_prototype());
+    return realm.heap().allocate<Locale>(realm, locale_id, *realm.global_object().intl_locale_prototype());
 }
 
 // 14 Locale Objects, https://tc39.es/ecma402/#locale-objects

Userland/Libraries/LibJS/Runtime/Intl/NumberFormatFunction.cpp

@@ -14,7 +14,7 @@ namespace JS::Intl {
 // 1.1.4 Number Format Functions, https://tc39.es/proposal-intl-numberformat-v3/out/numberformat/proposed.html#sec-number-format-functions
 NumberFormatFunction* NumberFormatFunction::create(Realm& realm, NumberFormat& number_format)
 {
-    return realm.heap().allocate<NumberFormatFunction>(realm.global_object(), number_format, *realm.global_object().function_prototype());
+    return realm.heap().allocate<NumberFormatFunction>(realm, number_format, *realm.global_object().function_prototype());
 }
 
 NumberFormatFunction::NumberFormatFunction(NumberFormat& number_format, Object& prototype)

Userland/Libraries/LibJS/Runtime/Intl/SegmentIterator.cpp

@@ -19,7 +19,7 @@ SegmentIterator* SegmentIterator::create(Realm& realm, Segmenter& segmenter, Utf
     // 4. Set iterator.[[IteratedString]] to string.
     // 5. Set iterator.[[IteratedStringNextSegmentCodeUnitIndex]] to 0.
     // 6. Return iterator.
-    return realm.heap().allocate<SegmentIterator>(realm.global_object(), realm, segmenter, move(string), segments);
+    return realm.heap().allocate<SegmentIterator>(realm, realm, segmenter, move(string), segments);
 }
 
 // 18.6 Segment Iterator Objects, https://tc39.es/ecma402/#sec-segment-iterator-objects

Userland/Libraries/LibJS/Runtime/Intl/Segments.cpp

@@ -18,7 +18,7 @@ Segments* Segments::create(Realm& realm, Segmenter& segmenter, Utf16String strin
     // 3. Set segments.[[SegmentsSegmenter]] to segmenter.
     // 4. Set segments.[[SegmentsString]] to string.
     // 5. Return segments.
-    return realm.heap().allocate<Segments>(realm.global_object(), realm, segmenter, move(string));
+    return realm.heap().allocate<Segments>(realm, realm, segmenter, move(string));
 }
 
 // 18.5 Segments Objects, https://tc39.es/ecma402/#sec-segments-objects