todt.d: transition to eSink

[WalterBright]

No description provided.

[github-actions]

DMD perf check

Metric	Base	PR	Δ
compile dmd itself (wall)	7.2 s	7.3 s	+2.55%

All measurements

Metric	Base	PR	Δ
compile hello.d (instr)	214.9 M	214.9 M	-0.002%
compile hello.d -O -release (instr)	233.2 M	233.2 M	-0.003%
compile Phobos (instr)	5,123.6 M	5,123.5 M	-0.001%
compile Phobos codegen (instr)	1,472.6 M	1,472.6 M	-0.003%
compile vibe.d (instr)	15,130.2 M	15,121.2 M	-0.060%
dmd binary size (stripped)	6.86 MB	6.86 MB	0.00%
hello binary size (stripped)	0.72 MB	0.72 MB	0.00%
peak RSS (compile hello.d)	43.62 MB	43.52 MB	-0.21%
peak RSS (compile Phobos)	619.2 MB	619.2 MB	+0.01%
peak RSS (compile vibe.d)	1919 MB	1917 MB	-0.10%
compile dmd itself (wall)	7.2 s	7.3 s	+2.55%
compile hello.d (wall)	39.6 ms	39.8 ms	+0.62%
compile Phobos (wall)	903 ms	907 ms	+0.44%

_{bb248bd vs merge-base 1906158 · about these metrics}