LibJS: Inline fast case for Value::to_{boolean,number,numeric,primitive}

These functions all have a very common case that can be dealt with a
very simple inline check, often avoiding the need to call an out-of-line
function. This patch moves the common case to inline functions in a new
ValueInlines.h header (necessary due to header dependency issues..)

8% speed-up on the entire Kraken benchmark :^)

Userland/Applications/Assistant/Providers.cpp

@@ -18,6 +18,7 @@
 #include <LibGUI/FileIconProvider.h>
 #include <LibJS/Bytecode/Interpreter.h>
 #include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/ValueInlines.h>
 #include <LibJS/Script.h>
 #include <errno.h>
 #include <fcntl.h>

Userland/Applications/Spreadsheet/Cell.cpp

@@ -8,6 +8,7 @@
 #include "Spreadsheet.h"
 #include <AK/StringBuilder.h>
 #include <AK/TemporaryChange.h>
+#include <LibJS/Runtime/ValueInlines.h>
 
 namespace Spreadsheet {
 

Userland/Applications/Spreadsheet/CellType/Numeric.cpp

@@ -9,6 +9,7 @@
 #include "../Spreadsheet.h"
 #include "Format.h"
 #include <AK/ScopeGuard.h>
+#include <LibJS/Runtime/ValueInlines.h>
 
 namespace Spreadsheet {
 

Userland/Applications/Spreadsheet/JSIntegration.cpp

@@ -12,6 +12,7 @@
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Object.h>
 #include <LibJS/Runtime/Value.h>
+#include <LibJS/Runtime/ValueInlines.h>
 
 namespace Spreadsheet {