Improve Character method performance

[lahma]

• use pre-calculated answers for chars, generate using a test case using old methods
• use HexConverter borrowed from .NET sources which has superior check performance for common case

We are mostly interested in normal ASCII range in the new benchmark (FullRange = false), which is the common case for parsing.

FileParsingBenchmark

Diff	Method	FileName	Mean	Error	Gen 0	Gen 1	Allocated
Old	ParseProgram	angular-1.2.5	8,674.9 μs	7.81 μs	250.0000	109.3750	4,315 KB
New			8,684.2 μs (0%)	45.42 μs	250.0000 (0%)	109.3750 (0%)	4,315 KB (0%)
Old	ParseProgram	backbone-1.1.0	1,170.2 μs	4.28 μs	41.0156	19.5313	676 KB
New			1,152.6 μs (-2%)	3.39 μs	41.0156 (0%)	19.5313 (0%)	676 KB (0%)
Old	ParseProgram	jquery-1.9.1	6,858.5 μs	10.11 μs	226.5625	78.1250	3,764 KB
New			6,740.3 μs (-2%)	14.19 μs	226.5625 (0%)	78.1250 (0%)	3,764 KB (0%)
Old	ParseProgram	jquery.mobile-1.4.2	10,638.7 μs	31.19 μs	343.7500	171.8750	5,798 KB
New			10,197.7 μs (-4%)	54.15 μs	343.7500 (0%)	171.8750 (0%)	5,798 KB (0%)
Old	ParseProgram	mootools-1.4.5	5,528.6 μs	20.89 μs	187.5000	78.1250	3,091 KB
New			5,435.6 μs (-2%)	11.80 μs	187.5000 (0%)	78.1250 (0%)	3,091 KB (0%)
Old	ParseProgram	underscore-1.5.2	995.5 μs	3.69 μs	33.2031	13.6719	571 KB
New			968.0 μs (-3%)	3.38 μs	33.2031 (0%)	13.6719 (0%)	571 KB (0%)
Old	ParseProgram	yui-3.12.0	5,002.1 μs	11.92 μs	171.8750	70.3125	2,856 KB
New			4,857.4 μs (-3%)	14.13 μs	171.8750 (0%)	70.3125 (0%)	2,856 KB (0%)

CharBenchmark

Method	FullRange	Mean	Error	StdDev	Gen 0	Allocated
IsHexDigit_Old	False	245.26 ns	0.424 ns	0.397 ns	-	-
IsHexDigit_New	False	28.56 ns	0.061 ns	0.057 ns	-	-
IsDecimalDigit_Old	False	28.89 ns	0.070 ns	0.062 ns	-	-
IsDecimalDigit_New	False	28.55 ns	0.071 ns	0.063 ns	-	-
IsWhiteSpace_Old	False	260.63 ns	0.291 ns	0.243 ns	-	-
IsWhiteSpace_New	False	160.01 ns	0.259 ns	0.243 ns	-	-
IsIdentifierStart_Old	False	298.28 ns	0.452 ns	0.401 ns	-	-
IsIdentifierStart_New	False	210.78 ns	0.477 ns	0.423 ns	-	-
IsIdentifierPart_Old	False	317.28 ns	0.394 ns	0.349 ns	-	-
IsIdentifierPart_New	False	210.90 ns	0.361 ns	0.301 ns	-	-
IsHexDigit_Old	True	119,770.80 ns	239.219 ns	199.759 ns	-	-
IsHexDigit_New	True	13,125.10 ns	36.490 ns	30.471 ns	-	-
IsDecimalDigit_Old	True	13,130.76 ns	20.747 ns	16.198 ns	-	-
IsDecimalDigit_New	True	13,150.19 ns	56.228 ns	49.844 ns	-	-
IsWhiteSpace_Old	True	180,220.15 ns	349.712 ns	292.025 ns	-	-
IsWhiteSpace_New	True	80,816.84 ns	120.292 ns	106.635 ns	-	-
IsIdentifierStart_Old	True	2,544,295.91 ns	14,167.876 ns	13,252.640 ns	89.8438	1,566,699 B
IsIdentifierStart_New	True	83,284.29 ns	285.621 ns	253.196 ns	-	-
IsIdentifierPart_Old	True	3,147,188.09 ns	24,110.925 ns	21,373.707 ns	89.8438	1,566,699 B
IsIdentifierPart_New	True	111,228.82 ns	462.914 ns	433.010 ns	-	-