adding ftime

[abulgit]

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DMD perf check

Metric	Base	PR	delta
compile hello.d (instr)	215.8 M	215.8 M	0.00%
compile hello.d -O (instr)	234.3 M	234.3 M	0.00%
compile Phobos (instr)	5,080.2 M	5,080.1 M	0.00%
dmd binary size (stripped)	6.88 MB	6.88 MB	0.00%
hello binary size	0.72 MB	0.72 MB	0.00%
peak RSS (compile hello.d)	43 MB	44 MB	+0.06%
peak RSS (compile Phobos)	633 MB	633 MB	-0.01%
frontend (parse+sema)	1106981	1115455	+0.77%
backend (inline+codegen)	393945	398880	+1.25%