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Speed up decoding of oversized integers #555

Job	Run time
head-versions (ubuntu, jruby-head)	59s
mri (ubuntu-latest, 3.2)	37s
other (ubuntu, jruby-9.4)	48s
head-versions (ubuntu, ruby-head)	1m 16s
mri (ubuntu-latest, 2.7)	49s
valgrind	5m 53s
other (ubuntu, truffleruby)	2m 22s
mri (ubuntu-latest, 3.3)	39s
mri (ubuntu-latest, 3.4)	43s
mri (ubuntu-latest, 2.5)	36s
mri (ubuntu-latest, 3.1)	39s
mri (ubuntu-latest, 2.6)	41s
mri (macos-latest, 2.6)	1m 3s
mri (ubuntu-latest, 4.0)	44s
mri (ubuntu-latest, 3.5)	40s
mri (ubuntu-latest, 3.0)	36s
mri (windows-latest, 2.5)	2m 33s
mri (macos-latest, 3.2)	42s
mri (windows-latest, 3.2)	1m 38s
	23m 58s