Implement first D-specific optimization pass: -simplify-drtcalls. It uses the machinery of the standard -simplify-libcalls pass, but optimizes calls to the D runtime instead of calls to C libraries. At the moment, these optimizations are implemented by this pass: - Avoid the runtime call for `arr.length = newlen` if it can determine that the new length isn't longer than the old one. - Ditto for `cast(T[]) arr` if it will clearly always succeed. (e.g. if the length of the original array is zero, or if the old element size is a multiple of the new element size)

module typeinfos1;

import
typeinfo1.ti_byte,
typeinfo1.ti_cdouble,
typeinfo1.ti_cfloat,
typeinfo1.ti_char,
typeinfo1.ti_creal,
typeinfo1.ti_dchar,
typeinfo1.ti_delegate,
typeinfo1.ti_double,
typeinfo1.ti_float,
typeinfo1.ti_idouble,
typeinfo1.ti_ifloat,
typeinfo1.ti_int,
typeinfo1.ti_ireal,
typeinfo1.ti_long,
typeinfo1.ti_ptr,
typeinfo1.ti_real,
typeinfo1.ti_short,
typeinfo1.ti_ubyte,
typeinfo1.ti_uint,
typeinfo1.ti_ulong,
typeinfo1.ti_ushort,
typeinfo1.ti_void,
typeinfo1.ti_wchar;