Bug 16297 – Immutable data with statically-known initializer should be implicitly "static"

This came up during the review of https://github.com/dlang/dmd/pull/5938. Consider: int fun(ubyte[] b) { immutable ubyte[4] d = [0x7F, 'E', 'L', 'F']; return b[] == d[]; } int gun(ubyte[] b) { static immutable ubyte[4] d = [0x7F, 'E', 'L', 'F']; return b[] == d[]; } By http://goo.gl/mxaVKe, different code is generated for these functions; namely, the immutable data in fun() is initialized with every call. An optimization would allocate that data statically.

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