Otherwise, C++ compilers will skip this constant when producing object files.

Fix segfault when Fixnum#chr doesn't return a string

Fix segfault in Array#sample

Fixed C declaration in re.h

mruby special.

Fixnum is usually big enough for shift width.

Reimplements Range#first

Fixed NaN boxing for 64-bit configrations

Fix typo in test

Useful for testing when using boxing on different platforms.

So that other files can immediately use it.

Definition of boxed pointer is following:
`111111111111TTTT TTPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP`

Previously, only the last 32-bit were set, and remaining 14 bits were zeroed when setting `ttt`.

Range#first shouldn't call `Range#to_a` on infinity range.

Fix for sprintf test exceeding bounds with MRB_INT16

Fix Range#size results

Fix condition of Range#include?

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