Make Function.prototype a function

[HalidOdat]

The Function.prototype is itself a function that has __proto__ == Object.prototype. I Know this is very weird

It changes the following:

• Make Function.prototype a function that return undefined
• Add tests

Here is the spec:

[codecov]

Codecov Report

Merging #802 into master will increase coverage by 0.07%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master     #802      +/-   ##
==========================================
+ Coverage   59.28%   59.35%   +0.07%     
==========================================
  Files         155      155              
  Lines        9924     9945      +21     
==========================================
+ Hits         5883     5903      +20     
- Misses       4041     4042       +1     

Impacted Files	Coverage Δ
boa/src/object/mod.rs	46.68% <68.75%> (+1.06%)	⬆️
boa/src/builtins/function/mod.rs	62.24% <83.33%> (+2.02%)	⬆️
boa/src/value/mod.rs	72.79% <0.00%> (+0.50%)	⬆️
boa/src/object/gcobject.rs	74.78% <0.00%> (+1.68%)	⬆️

---

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[github-actions]

Benchmark for f30c6e4

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Arithmetic operations (Execution)	370.2±0.19ns	370.2±0.15ns	0.00%
Arithmetic operations (Full)	253.4±0.53µs	252.6±0.62µs	+0.32%
Array access (Execution)	7.9±0.03µs	7.9±0.03µs	0.00%
Array access (Full)	273.6±0.40µs	274.3±0.73µs	-0.26%
Array creation (Execution)	3.2±0.00ms	3.4±0.00ms	-5.88%
Array creation (Full)	3.7±0.00ms	3.7±0.00ms	0.00%
Array pop (Execution)	1129.0±25.43µs	1210.0±5.70µs	-6.69%
Array pop (Full)	1677.5±5.69µs	1675.3±9.18µs	+0.13%
Boolean Object Access (Execution)	5.0±0.01µs	5.0±0.01µs	0.00%
Boolean Object Access (Full)	267.3±2.48µs	263.1±0.65µs	+1.60%
Clean js (Execution)	730.4±3.54µs	745.4±4.19µs	-2.01%
Clean js (Full)	1046.2±13.40µs	1039.7±8.40µs	+0.63%
Clean js (Parser)	36.1±0.03µs	35.9±0.05µs	+0.56%
Create Realm	474.9±0.19ns	474.0±0.31ns	+0.19%
Dynamic Object Property Access (Execution)	5.6±0.01µs	5.6±0.02µs	0.00%
Dynamic Object Property Access (Full)	266.7±0.60µs	264.3±0.60µs	+0.91%
Expression (Parser)	6.8±0.01µs	6.7±0.01µs	+1.49%
Fibonacci (Execution)	812.7±0.70µs	822.9±5.34µs	-1.24%
Fibonacci (Full)	1114.7±1.54µs	1101.7±1.92µs	+1.18%
For loop (Execution)	22.2±0.07µs	22.5±0.11µs	-1.33%
For loop (Full)	289.6±0.50µs	286.5±0.72µs	+1.08%
For loop (Parser)	17.7±0.02µs	17.6±0.03µs	+0.57%
Goal Symbols (Parser)	12.1±0.09µs	12.0±0.02µs	+0.83%
Hello World (Parser)	3.1±0.01µs	3.1±0.01µs	0.00%
Long file (Parser)	767.9±0.89ns	772.4±1.23ns	-0.58%
Mini js (Execution)	661.0±13.34µs	672.6±5.92µs	-1.72%
Mini js (Full)	956.8±4.83µs	960.9±3.30µs	-0.43%
Mini js (Parser)	31.7±0.13µs	31.7±0.03µs	0.00%
Number Object Access (Execution)	4.0±0.00µs	4.1±0.01µs	-2.44%
Number Object Access (Full)	261.4±2.12µs	258.8±0.58µs	+1.00%
Object Creation (Execution)	4.7±0.02µs	4.7±0.02µs	0.00%
Object Creation (Full)	266.0±1.35µs	261.1±0.98µs	+1.88%
RegExp (Execution)	65.5±0.84µs	65.6±0.86µs	-0.15%
RegExp (Full)	344.1±1.01µs	341.1±0.85µs	+0.88%
RegExp Literal (Execution)	68.5±1.14µs	68.7±1.39µs	-0.29%
RegExp Literal (Full)	346.3±1.33µs	340.6±0.70µs	+1.67%
RegExp Literal Creation (Execution)	65.6±0.92µs	65.8±0.89µs	-0.30%
RegExp Literal Creation (Full)	338.7±0.91µs	337.4±0.76µs	+0.39%
Static Object Property Access (Execution)	5.0±0.01µs	5.0±0.06µs	0.00%
Static Object Property Access (Full)	266.8±0.56µs	265.0±0.50µs	+0.68%
String Object Access (Execution)	7.2±0.10µs	7.2±0.02µs	0.00%
String Object Access (Full)	269.0±0.56µs	268.0±0.60µs	+0.37%
String comparison (Execution)	6.3±0.01µs	6.5±0.02µs	-3.08%
String comparison (Full)	269.8±0.42µs	264.8±0.32µs	+1.89%
String concatenation (Execution)	5.1±0.01µs	5.3±0.01µs	-3.77%
String concatenation (Full)	262.0±0.35µs	261.3±0.27µs	+0.27%
String copy (Execution)	3.9±0.01µs	4.0±0.01µs	-2.50%
String copy (Full)	256.7±0.43µs	254.7±0.51µs	+0.79%
Symbols (Execution)	3.3±0.01µs	3.3±0.01µs	0.00%
Symbols (Full)	254.8±0.47µs	252.1±0.40µs	+1.07%