Remove closure allocations from JintFunctionDefinition

[lahma]

Jint.Benchmark.DromaeoBenchmark

Diff	Method	FileName	Mean	Error	Allocated
Old	Run	dromaeo-3d-cube	15.385 ms	0.2515 ms	6305.56 KB
New			15.568 ms (+1%)	0.1567 ms	6215.83 KB (-1%)
Old	Run	dromaeo-core-eval	3.041 ms	0.0381 ms	327.41 KB
New			3.122 ms (+3%)	0.0254 ms	327.06 KB (0%)
Old	Run	dromaeo-object-array	31.828 ms	0.2936 ms	96259.1 KB
New			31.940 ms (0%)	0.1914 ms	96258.38 KB (0%)
Old	Run	droma(...)egexp [21]	123.952 ms	2.4561 ms	149449.74 KB
New			124.259 ms (0%)	2.4668 ms	151579.51 KB (+1%)
Old	Run	droma(...)tring [21]	238.855 ms	5.2330 ms	1315958.49 KB
New			244.141 ms (+2%)	6.9506 ms	1315860.24 KB (0%)
Old	Run	droma(...)ase64 [21]	35.305 ms	0.4351 ms	2367.42 KB
New			34.810 ms (-1%)	0.5486 ms	2367.03 KB (0%)
Old	Run	dromaeo-3d-cube	15.041 ms	0.1465 ms	5967.31 KB
New			14.848 ms (-1%)	0.1598 ms	5877.58 KB (-2%)
Old	Run	dromaeo-core-eval	3.066 ms	0.0264 ms	312.35 KB
New			3.264 ms (+6%)	0.0227 ms	311.99 KB (0%)
Old	Run	dromaeo-object-array	32.979 ms	0.4518 ms	96211.68 KB
New			31.887 ms (-3%)	0.4474 ms	96210.99 KB (0%)
Old	Run	droma(...)egexp [21]	96.108 ms	1.9185 ms	152222.83 KB
New			88.918 ms (-7%)	1.7744 ms	150412.28 KB (-1%)
Old	Run	droma(...)tring [21]	243.834 ms	4.8618 ms	1315744.62 KB
New			242.248 ms (-1%)	6.3641 ms	1315700.62 KB (0%)
Old	Run	droma(...)ase64 [21]	34.412 ms	0.4386 ms	2268.26 KB
New			34.364 ms (0%)	0.3516 ms	2267.87 KB (0%)

Jint.Benchmark.SunSpiderBenchmark

Diff	Method	FileName	Mean	Error	Allocated
Old	Run	3d-cube	122.85 ms	1.239 ms	45166.97 KB
New			123.38 ms (0%)	1.403 ms	44653.93 KB (-1%)
Old	Run	3d-morph	110.68 ms	0.736 ms	46258.12 KB
New			111.42 ms (+1%)	1.204 ms	46257.53 KB (0%)
Old	Run	3d-raytrace	117.33 ms	1.259 ms	86419.7 KB
New			116.28 ms (-1%)	1.775 ms	84207.66 KB (-3%)
Old	Run	access-binary-trees	66.71 ms	1.304 ms	62249.15 KB
New			64.45 ms (-3%)	0.746 ms	57318.84 KB (-8%)
Old	Run	access-fannkuch	269.99 ms	2.952 ms	103.82 KB
New			272.92 ms (+1%)	3.480 ms	103.78 KB (0%)
Old	Run	access-nbody	128.52 ms	1.207 ms	53295.29 KB
New			128.38 ms (0%)	1.167 ms	53117.14 KB (0%)
Old	Run	access-nsieve	90.79 ms	0.946 ms	17142.64 KB
New			90.80 ms (0%)	0.727 ms	17142.49 KB (0%)
Old	Run	bitop(...)-byte [24]	98.41 ms	1.170 ms	61948.44 KB
New			98.24 ms (0%)	1.180 ms	56948.4 KB (-8%)
Old	Run	bitops-bits-in-byte	150.54 ms	1.540 ms	40544.67 KB
New			148.96 ms (-1%)	1.652 ms	37044.63 KB (-9%)
Old	Run	bitops-bitwise-and	84.62 ms	1.058 ms	55939.01 KB
New			84.76 ms (0%)	0.764 ms	55939.01 KB (0%)
Old	Run	bitops-nsieve-bits	145.31 ms	2.736 ms	53916.37 KB
New			138.66 ms (-5%)	1.851 ms	53916.29 KB (0%)
Old	Run	contr(...)rsive [21]	77.20 ms	1.515 ms	92772.92 KB
New			77.20 ms (0%)	1.261 ms	83183.56 KB (-10%)
Old	Run	crypto-aes	84.26 ms	1.576 ms	10729.22 KB
New			84.41 ms (0%)	1.077 ms	10341.31 KB (-4%)
Old	Run	crypto-md5	71.44 ms	0.758 ms	82176.41 KB
New			69.40 ms (-3%)	1.195 ms	77797.5 KB (-5%)
Old	Run	crypto-sha1	68.84 ms	0.691 ms	68861.17 KB
New			67.90 ms (-1%)	1.013 ms	64485.15 KB (-6%)
Old	Run	date-format-tofte	67.77 ms	0.598 ms	54161.32 KB
New			66.54 ms (-2%)	0.851 ms	53477.73 KB (-1%)
Old	Run	date-format-xparb	39.28 ms	0.749 ms	26400.21 KB
New			38.11 ms (-3%)	0.744 ms	24992.57 KB (-5%)
Old	Run	math-cordic	214.22 ms	3.227 ms	86859.41 KB
New			223.02 ms (+4%)	2.089 ms	81976.09 KB (-6%)
Old	Run	math-partial-sums	77.12 ms	1.001 ms	49367.9 KB
New			77.27 ms (0%)	1.241 ms	49367.66 KB (0%)
Old	Run	math-spectral-norm	86.40 ms	1.429 ms	56617.53 KB
New			80.34 ms (-7%)	1.543 ms	51826.74 KB (-8%)
Old	Run	regexp-dna	102.67 ms	1.791 ms	16826.82 KB
New			96.15 ms (-6%)	1.742 ms	16828.59 KB (0%)
Old	Run	string-base64	52.07 ms	0.632 ms	3156.22 KB
New			51.68 ms (-1%)	0.698 ms	3156.06 KB (0%)
Old	Run	string-fasta	114.49 ms	2.138 ms	104786.35 KB
New			115.00 ms (0%)	2.109 ms	102598.66 KB (-2%)
Old	Run	string-tagcloud	53.54 ms	0.707 ms	42219.39 KB
New			51.34 ms (-4%)	0.447 ms	40456.12 KB (-4%)
Old	Run	string-unpack-code	51.93 ms	0.766 ms	73810.43 KB
New			51.31 ms (-1%)	0.885 ms	69834.8 KB (-5%)
Old	Run	strin(...)input [21]	43.31 ms	0.840 ms	20687.13 KB
New			42.54 ms (-2%)	0.537 ms	19905.84 KB (-4%)