merge gmp 6.2.0.

merge GMP 6.1.2.

PR/48419 - Henning Petersen -- unbalanced parenthesis

initial import of GMP 5.0.2.

GNU MP is a library for arbitrary precision arithmetic, operating on signed
integers, rational numbers, and floating point numbers. It has a rich set
of functions, and

initial import of GMP 5.0.2.

GNU MP is a library for arbitrary precision arithmetic, operating on signed
integers, rational numbers, and floating point numbers. It has a rich set
of functions, and the functions have a regular interface.

GMP is necessary for GCC >= 4.2.

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