JIT

Add preprocessor declarations to support compiling on iOS. #3

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	16m 10s
i686-pc-windows-msvc/msvc (Release)	20m 0s
x86_64-pc-windows-msvc/msvc (Debug)	15m 46s
x86_64-pc-windows-msvc/msvc (Release)	21m 2s
x86_64-apple-darwin/clang (Debug)	10m 58s
x86_64-apple-darwin/clang (Release)	16m 30s
aarch64-apple-darwin/clang (Debug)	8m 38s
aarch64-apple-darwin/clang (Release)	13m 50s
x86_64-unknown-linux-gnu/gcc (Debug)	6m 44s
x86_64-unknown-linux-gnu/gcc (Release)	15m 58s
x86_64-unknown-linux-gnu/clang (Debug)	7m 0s
x86_64-unknown-linux-gnu/clang (Release)	13m 3s
aarch64-unknown-linux-gnu/gcc (Debug)	55m 57s
aarch64-unknown-linux-gnu/gcc (Release)	43m 39s
aarch64-unknown-linux-gnu/clang (Debug)	50m 25s
aarch64-unknown-linux-gnu/clang (Release)	29m 24s
	5h 45m 4s

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