kernel: simplify LtPRec code #5902

Job	Run time
testinstall - - ubuntu-latest	4m 39s
teststandard - - ubuntu-latest	19m 15s
testmanuals - - ubuntu-latest	5m 53s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 46s
testpackages testinstall-loadall - - ubuntu-latest	26m 7s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	5m 16s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 1s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 35s
Cross compiler for s390x	26m 41s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	3m 19s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	28m 41s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 20s
Test in OpenBSD	7m 42s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 9s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug" - ubuntu-20.04	4m 47s
testmockpkg testinstall - - windows-2019	15m 41s
Send Slack notification on status change	0s
	3h 8m 52s

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