Update test262 to latest and fix issues

[lahma]

Adding support for __proto__ as they introduced test cases which depend on it. Not endorsed feature but basically every runtime supports its.

Implemented checks when producing array operations handler that checks if array instance chain is uncontaminated and can successfully use the fast path, otherwise choose slower object property based. There are examples where JS gets injected with something like Object.defineProperty(Object.prototype, "0", some_descriptor_which_has_setter_that_mutates_length), so basically catching those rare occasions and switching to slow mode (full property setters instead of fast array index set inside array).

Some other minor tweaks.

[lahma]

After utilizing new info about how and when can some faster patterns can be used, results:

Esprima.Benchmark.SunSpiderBenchmark

Diff	Method	FileName	Mean	Error	Gen 0	Gen 1	Gen 2	Allocated
Old	Run	3d-cube	256.73 ms	1.156 ms	3000.0000	500.0000	-	52 MB
New			250.19 ms (-3%)	0.401 ms	3000.0000 (0%)	500.0000 (0%)	-	51,802 KB (-3%)
Old	Run	3d-morph	227.13 ms	1.439 ms	4333.3333	1333.3333	333.3333	66 MB
New			196.19 ms (-14%)	0.636 ms	2000.0000 (-54%)	1000.0000 (-25%)	-	49,797 KB (-26%)
Old	Run	3d-raytrace	202.73 ms	0.631 ms	5000.0000	1000.0000	-	92 MB
New			200.68 ms (-1%)	0.538 ms	5000.0000 (0%)	1000.0000 (0%)	-	94,150 KB (0%)
Old	Run	access-binary-trees	103.26 ms	0.196 ms	4800.0000	400.0000	-	77 MB
New			102.65 ms (-1%)	0.712 ms	4800.0000 (0%)	400.0000 (0%)	-	78,538 KB (0%)
Old	Run	access-fannkuch	687.57 ms	1.110 ms	2000.0000	-	-	38 MB
New			588.80 ms (-14%)	4.182 ms	-	-	-	229 KB (-99%)
Old	Run	access-nbody	241.22 ms	0.692 ms	3000.0000	-	-	63 MB
New			239.21 ms (-1%)	0.910 ms	3000.0000 (0%)	-	-	64,069 KB (-1%)
Old	Run	access-nsieve	242.43 ms	1.319 ms	4000.0000	1333.3333	333.3333	61 MB
New			188.16 ms (-22%)	0.920 ms	1000.0000 (-75%)	-	-	21,569 KB (-65%)
Old	Run	bitop(...)-byte [24]	210.96 ms	0.566 ms	4000.0000	-	-	67 MB
New			205.27 ms (-3%)	0.965 ms	4000.0000 (0%)	-	-	68,986 KB (+1%)
Old	Run	bitops-bits-in-byte	307.46 ms	1.718 ms	2500.0000	-	-	44 MB
New			311.74 ms (+1%)	0.482 ms	2500.0000 (0%)	-	-	45,475 KB (+1%)
Old	Run	bitops-bitwise-and	219.29 ms	3.217 ms	5000.0000	-	-	91 MB
New			208.82 ms (-5%)	0.933 ms	5000.0000 (0%)	-	-	93,452 KB (0%)
Old	Run	bitops-nsieve-bits	276.71 ms	1.117 ms	4000.0000	1000.0000	-	67 MB
New			247.61 ms (-11%)	1.080 ms	3000.0000 (-25%)	1000.0000 (0%)	-	54,912 KB (-20%)
Old	Run	contr(...)rsive [21]	155.10 ms	2.365 ms	7000.0000	2000.0000	-	121 MB
New			150.50 ms (-3%)	0.504 ms	7000.0000 (0%)	2000.0000 (0%)	-	124,168 KB (0%)
Old	Run	crypto-aes	185.39 ms	0.424 ms	1000.0000	-	-	26 MB
New			162.74 ms (-12%)	0.297 ms	-	-	-	16,266 KB (-39%)
Old	Run	crypto-md5	132.36 ms	0.656 ms	5000.0000	1000.0000	-	95 MB
New			128.50 ms (-3%)	0.482 ms	5000.0000 (0%)	1000.0000 (0%)	-	95,991 KB (-1%)
Old	Run	crypto-sha1	136.46 ms	0.672 ms	5000.0000	1000.0000	-	81 MB
New			134.96 ms (-1%)	0.408 ms	5000.0000 (0%)	250.0000 (-75%)	-	82,364 KB (-1%)
Old	Run	date-format-tofte	125.97 ms	1.218 ms	3000.0000	-	-	60 MB
New			128.54 ms (+2%)	0.254 ms	3000.0000 (0%)	1000.0000	-	61,651 KB (0%)
Old	Run	date-format-xparb	70.24 ms	0.125 ms	1750.0000	750.0000	-	29 MB
New			69.78 ms (-1%)	0.142 ms	1750.0000 (0%)	750.0000 (0%)	-	29,846 KB (+1%)
Old	Run	math-cordic	441.91 ms	2.317 ms	7000.0000	-	-	121 MB
New			449.64 ms (+2%)	1.136 ms	7000.0000 (0%)	-	-	124,045 KB (0%)
Old	Run	math-partial-sums	159.78 ms	1.432 ms	4000.0000	-	-	67 MB
New			158.05 ms (-1%)	0.502 ms	4000.0000 (0%)	-	-	69,006 KB (+1%)
Old	Run	math-spectral-norm	164.88 ms	0.530 ms	4000.0000	-	-	66 MB
New			163.07 ms (-1%)	0.851 ms	4000.0000 (0%)	-	-	67,258 KB (0%)
Old	Run	regexp-dna	110.52 ms	2.144 ms	1000.0000	1000.0000	1000.0000	17 MB
New			106.98 ms (-3%)	0.810 ms	1200.0000 (+20%)	1200.0000 (+20%)	1200.0000 (+20%)	17,724 KB (+2%)
Old	Run	string-base64	126.88 ms	0.378 ms	-	-	-	12 MB
New			124.86 ms (-2%)	0.435 ms	-	-	-	12,716 KB (+3%)
Old	Run	string-fasta	239.36 ms	1.064 ms	10333.3333	333.3333	-	165 MB
New			229.66 ms (-4%)	0.322 ms	10000.0000 (-3%)	333.3333 (0%)	-	167,373 KB (-1%)
Old	Run	string-tagcloud	85.12 ms	0.520 ms	3166.6667	1166.6667	500.0000	51 MB
New			85.18 ms (0%)	0.324 ms	3666.6667 (+16%)	1666.6667 (+43%)	666.6667 (+33%)	52,707 KB (+1%)
Old	Run	string-unpack-code	86.09 ms	0.485 ms	5000.0000	500.0000	-	83 MB
New			83.99 ms (-2%)	0.278 ms	5000.0000 (0%)	500.0000 (0%)	-	85,018 KB (0%)
Old	Run	strin(...)input [21]	101.88 ms	0.409 ms	2000.0000	1000.0000	-	44 MB
New			103.41 ms (+2%)	0.260 ms	2000.0000 (0%)	1000.0000 (0%)	-	44,720 KB (-1%)