Fix option optimisation compiler bug #7967

Job	Run time
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	4m 17s
build-compiler (macos-14, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	4m 59s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static, linux-x64, x86_6...	2m 49s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	3m 34s
build-compiler (windows-latest, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu)	4m 25s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static, linux-x64, x86_64...	2m 10s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	2m 30s
build-compiler (macos-13, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	6m 32s
pkg-pr-new	56s
api-docs	2m 9s
test-installation-pnpm (macos-13)	25s
test-installation-npm (ubuntu-24.04-arm)	35s
test-installation-npm (macos-13)	26s
test-installation-npm (ubuntu-24.04)	20s
test-installation-pnpm (ubuntu-24.04)	19s
test-installation-pnpm (macos-14)	24s
test-installation-npm (macos-14)	22s
test-installation-pnpm (windows-latest)	35s
test-installation-npm (windows-latest)	58s
test-integration-rewatch (ubuntu-24.04)	51s
test-integration-rewatch (ubuntu-24.04-arm)	49s
test-integration-rewatch (macos-13)	1m 12s
test-integration-rewatch (macos-14)	48s
test-integration-rewatch (windows-latest)	1m 29s
test-installation-pnpm (ubuntu-24.04-arm)	18s
publish	-1s
	44m 11s

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