Apply recent C optimizations to Java encoder #704

Job	Run time
Ruby memcheck	1m 33s
ruby-versions / Generate Ruby versions	1s
ubuntu-22.04 2.7	57s
ubuntu-22.04 3.0	30s
ubuntu-22.04 3.1	46s
ubuntu-22.04 3.2	44s
ubuntu-22.04 3.3	33s
ubuntu-22.04 3.4	36s
ubuntu-22.04 head	1m 20s
ubuntu-22.04 jruby	1m 15s
ubuntu-22.04 jruby-head	1m 10s
macos-13 2.7	2m 2s
macos-13 3.0	44s
macos-13 3.1	41s
macos-13 3.2	47s
macos-13 3.3	1m 0s
macos-13 3.4	52s
macos-13 head	44s
macos-13 jruby	1m 36s
macos-13 jruby-head	2m 3s
macos-14 2.7	1m 18s
macos-14 3.0	20s
macos-14 3.1	26s
macos-14 3.2	22s
macos-14 3.3	20s
macos-14 3.4	27s
macos-14 head	19s
macos-14 jruby	55s
macos-14 jruby-head	43s
windows-latest 2.7	4m 12s
windows-latest 3.0	2m 42s
windows-latest 3.1	2m 42s
windows-latest 3.2	1m 50s
windows-latest 3.3	2m 34s
windows-latest 3.4	2m 40s
windows-latest head	2m 43s
windows-latest mswin	2m 9s
ubuntu-latest jruby-9.4	2m 52s
macos-latest truffleruby-head	38s
ubuntu-latest truffleruby-head	2m 5s
	52m 11s

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