Optimize DeclarativeEnvironmentRecord

[lahma]

Now improving performance of my pet peeve UncacheableExpressionsBenchmark.

• use MruPropertyCache2 and common parameter "arguments" as stored field, now dictionary won't be created for common arguments + single extra parameter
• add missing implicit JsValue operators for uint and char, used sub-optimal double path
• simplify often called JsValue Is* As* methods that have unnecessary nesting and logic

UncacheableExpressionsBenchmark execution time went down 22%, Map time went down 37%. 10% reduction in UncacheableExpressionsBenchmark memory usage.

Before (dev)

Method	N	Mean	Error	StdDev	Gen 0	Allocated
Slice	100	1.199 ms	0.0249 ms	0.0233 ms	240.2344	986.72 KB
Concat	100	1.289 ms	0.0132 ms	0.0117 ms	259.7656	1070.31 KB
Unshift	100	38.819 ms	0.2905 ms	0.2718 ms	7000.0000	28789.06 KB
Push	100	25.200 ms	0.1081 ms	0.1011 ms	1625.0000	6766.41 KB
Index	100	26.802 ms	0.2575 ms	0.2409 ms	1531.2500	6333.59 KB
Map	100	7.339 ms	0.1466 ms	0.1299 ms	2109.3750	8692.19 KB
Apply	100	1.255 ms	0.0013 ms	0.0010 ms	267.5781	1098.44 KB
JsonStringifyParse	100	6.944 ms	0.0086 ms	0.0067 ms	1484.3750	6103.91 KB

Method	N	Mean	Error	StdDev	Gen 0	Gen 1	Allocated
UncacheableExpressionsBenchmark	500	740.1 ms	78.08 ms	4.412 ms	129750.0000	36562.5000	556.2 MB

After (this branch)

Method	N	Mean	Error	StdDev	Gen 0	Allocated
Slice	100	910.4 us	6.458 us	5.725 us	239.2578	982.81 KB
Concat	100	1,007.7 us	2.083 us	1.847 us	258.7891	1062.5 KB
Unshift	100	36,668.5 us	86.661 us	81.063 us	7000.0000	28785.16 KB
Push	100	24,286.9 us	30.631 us	28.653 us	1625.0000	6762.5 KB
Index	100	25,788.4 us	19.635 us	16.396 us	1531.2500	6333.59 KB
Map	100	4,607.4 us	10.529 us	9.333 us	1804.6875	7420.31 KB
Apply	100	1,023.9 us	3.040 us	2.843 us	267.5781	1098.44 KB
JsonStringifyParse	100	6,671.7 us	11.872 us	11.105 us	1484.3750	6100 KB

Method	N	Mean	Error	StdDev	Gen 0	Gen 1	Allocated
UncacheableExpressionsBenchmark	500	578.6 ms	29.91 ms	1.690 ms	114937.5000	32791.6667	494.71 MB