Remove BigDecimal_divremain(which has a bug) and use BigDecimal_DoDiv… #528

Job	Run time
ruby-versions / Generate Ruby versions	15s
ubuntu-latest 3.2	41s
ubuntu-latest 2.7	1m 16s
ubuntu-latest 2.6	1m 0s
macos-latest 3.2	30s
macos-latest 2.7	1m 10s
macos-latest 2.6	1m 9s
macos-latest 3.1	39s
macos-latest 3.3	28s
ubuntu-latest 2.5	54s
ubuntu-latest 3.1	48s
ubuntu-latest 3.4	57s
ubuntu-latest 3.3	41s
ubuntu-latest truffleruby	1m 37s
macos-latest 3.0	29s
macos-14 3.2	25s
ubuntu-latest head	48s
macos-latest head	25s
macos-latest truffleruby	55s
macos-14 3.0	27s
macos-14 3.3	22s
macos-14 2.7	41s
macos-latest 3.4	34s
macos-14 head	26s
macos-14 truffleruby	54s
macos-14 truffleruby-head	1m 15s
macos-latest debug	36s
windows-latest 2.7	4m 24s
windows-latest 3.4	3m 32s
windows-latest mingw	3m 12s
macos-latest truffleruby-head	1m 16s
windows-latest 3.3	3m 9s
ubuntu-latest debug	37s
macos-14 2.6	38s
ubuntu-latest 3.0	37s
windows-latest 3.0	3m 57s
windows-latest mswin	2m 52s
windows-latest 2.6	4m 8s
windows-latest 2.5	3m 44s
macos-14 3.4	19s
ubuntu-latest truffleruby-head	1m 36s
macos-14 debug	30s
macos-14 3.1	25s
windows-latest head	3m 44s
windows-latest 3.2	3m 23s
windows-latest 3.1	3m 5s
	1h 5m 30s

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