Merge pull request #115 from WebAssembly/builtins-merge #106

Job	Run time
build-core-spec	13m 14s
build-web-api-spec	28s
build-legacy-exceptions-core-spec	1m 56s
build-code-metadata-spec	2m 57s
build-spec-versions	7s
build-js-api-spec	33s
build-legacy-exceptions-js-api-spec	28s
publish-spec	16s
	19m 59s

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