perf: improve type checking performance of BuildMany

[gvergnaud]

Performance improvement results

tsc --project tests/tsconfig.json --noEmit --extendedDiagnostics

Category	Before	After	Evolution (%)
Files	206	206	0%
Lines of Library	40,612	40,612	0%
Lines of Definitions	27,266	27,266	0%
Lines of TypeScript	16,129	16,149	0.12%
Lines of JavaScript	0	0	-
Lines of JSON	0	0	-
Lines of Other	0	0	-
Identifiers	121,119	121,150	0.03%
Symbols	854,220	861,962	0.93%
Types	435,316	432,599	-0.65%
Instantiations	6,735,991	4,562,378	-32.33%
Memory used	732,233K	746,454K	1.95%
Assignability cache size	209,959	205,926	-1.92%
Identity cache size	28,093	28,250	0.56%
Subtype cache size	2,944	2,944	0%
Strict subtype cache size	4,628	4,628	0%
I/O Read time	0.01s	0.02s	100%
Parse time	0.21s	0.20s	-4.76%
ResolveModule time	0.02s	0.02s	0%
ResolveTypeReference time	0.00s	0.01s	-
ResolveLibrary time	0.01s	0.01s	0%
Program time	0.27s	0.27s	0%
Bind time	0.13s	0.13s	0%
Check time	5.78s	4.83s	-16.44%
printTime time	0.00s	0.00s	-
Emit time	0.00s	0.00s	-
Total time	6.19s	5.23s	-15.51%

[gvergnaud]

Removing compute and using an homomorphic object decreases the number of instantiations by 33%.