Add performance measurement harness for DMD

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DMD perf check

Metric	Base	PR	delta
compile hello.d (instr)	422.8 M	457.8 M	+8.27%
compile hello.d -O (instr)	445.9 M	480.9 M	+7.84%
dmd binary size (stripped)	11.93 MB	11.93 MB	+0.03%
hello binary size	0.72 MB	0.72 MB	0.00%
peak RSS (compile hello.d)	54 MB	55 MB	+0.80%