LibJS+LibWeb: Move headers around to allow including Value from Cell

The goal here is to allow Cell::initialize to return a ThrowCompletion,
to handle OOM for example. Cell.h will then need to include Completion.h
which must include Value.h. This currently can't happen because Value.h
includes BigInt.h, which in turn includes Cell.h. So we would have an
include cycle.

This removes BigInt.h from Value.h, as it is forward-declarable (it is
only referred to with a reference or pointer). Then the Value overload
for Cell::Visitor::visit is moved to Cell.h, and missing BigInt.h
includes as peppered as needed.

Userland/Libraries/LibJS/Heap/Cell.h

@@ -13,6 +13,7 @@
 #include <AK/StringView.h>
 #include <LibJS/Forward.h>
 #include <LibJS/Heap/GCPtr.h>
+#include <LibJS/Runtime/Value.h>
 
 namespace JS {
 
@@ -53,22 +54,30 @@ public:
             if (cell)
                 visit_impl(*cell);
         }
+
         void visit(Cell& cell)
         {
             visit_impl(cell);
         }
+
         template<typename T>
         void visit(GCPtr<T> cell)
         {
             if (cell)
                 visit_impl(*cell.ptr());
         }
+
         template<typename T>
         void visit(NonnullGCPtr<T> cell)
         {
             visit_impl(*cell.ptr());
         }
-        void visit(Value);
+
+        void visit(Value value)
+        {
+            if (value.is_cell())
+                visit_impl(value.as_cell());
+        }
 
     protected:
         virtual void visit_impl(Cell&) = 0;

Userland/Libraries/LibJS/Runtime/ArrayBuffer.h

@@ -9,6 +9,7 @@
 #include <AK/ByteBuffer.h>
 #include <AK/Function.h>
 #include <AK/Variant.h>
+#include <LibJS/Runtime/BigInt.h>
 #include <LibJS/Runtime/Completion.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Object.h>

Userland/Libraries/LibJS/Runtime/Date.h

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <LibCrypto/BigInt/SignedBigInteger.h>
 #include <LibJS/Runtime/Object.h>
 
 namespace JS {

Userland/Libraries/LibJS/Runtime/Intl/MathematicalValue.h

@@ -10,6 +10,7 @@
 #include <AK/String.h>
 #include <AK/Variant.h>
 #include <LibCrypto/BigInt/SignedBigInteger.h>
+#include <LibJS/Runtime/BigInt.h>
 #include <LibJS/Runtime/Value.h>
 
 namespace JS::Intl {

Userland/Libraries/LibJS/Runtime/NumberConstructor.cpp

@@ -6,6 +6,7 @@
 
 #include <AK/Math.h>
 #include <LibJS/Runtime/AbstractOperations.h>
+#include <LibJS/Runtime/BigInt.h>
 #include <LibJS/Runtime/Error.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/NumberConstructor.h>

Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.h

@@ -9,6 +9,7 @@
 
 #include <AK/Forward.h>
 #include <AK/Variant.h>
+#include <LibCrypto/BigInt/SignedBigInteger.h>
 #include <LibJS/Forward.h>
 #include <LibJS/Runtime/Completion.h>
 #include <LibJS/Runtime/GlobalObject.h>

Userland/Libraries/LibJS/Runtime/Value.h

@@ -19,7 +19,6 @@
 #include <AK/Types.h>
 #include <LibJS/Forward.h>
 #include <LibJS/Heap/GCPtr.h>
-#include <LibJS/Runtime/BigInt.h>
 #include <math.h>
 
 // 2 ** 53 - 1
@@ -526,12 +525,6 @@ inline Value js_negative_infinity()
     return Value(-INFINITY);
 }
 
-inline void Cell::Visitor::visit(Value value)
-{
-    if (value.is_cell())
-        visit_impl(value.as_cell());
-}
-
 ThrowCompletionOr<Value> greater_than(VM&, Value lhs, Value rhs);
 ThrowCompletionOr<Value> greater_than_equals(VM&, Value lhs, Value rhs);
 ThrowCompletionOr<Value> less_than(VM&, Value lhs, Value rhs);

Userland/Libraries/LibJS/Runtime/ValueTraits.h

@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include <LibJS/Runtime/BigInt.h>
 #include <LibJS/Runtime/PrimitiveString.h>
 #include <LibJS/Runtime/Value.h>
 

Userland/Libraries/LibWeb/Layout/Box.h

@@ -8,6 +8,7 @@
 
 #include <AK/OwnPtr.h>
 #include <LibGfx/Rect.h>
+#include <LibJS/Heap/Cell.h>
 #include <LibWeb/Layout/Node.h>
 
 namespace Web::Layout {

Userland/Libraries/LibWeb/Layout/Node.h

@@ -10,6 +10,7 @@
 #include <AK/TypeCasts.h>
 #include <AK/Vector.h>
 #include <LibGfx/Rect.h>
+#include <LibJS/Heap/Cell.h>
 #include <LibJS/Heap/Handle.h>
 #include <LibWeb/CSS/ComputedValues.h>
 #include <LibWeb/CSS/StyleProperties.h>

Userland/Libraries/LibWeb/TreeNode.h

@@ -8,6 +8,7 @@
 
 #include <AK/Assertions.h>
 #include <AK/TypeCasts.h>
+#include <LibJS/Heap/Cell.h>
 #include <LibJS/Heap/GCPtr.h>
 #include <LibWeb/Forward.h>