[fortran,committed] Emit direct calls to malloc() and free()

[FX]

For the MALLOC and FREE Cray pointer-related intrinsics, we used to emit calls to _gfortran_malloc and _gfortran_free, which would in turn call the libc routines. The attached patch makes us directly emit the calls to the BUILT_IN_MALLOC and BUILT_IN_FREE.

Committed as revision 227311 after regtesting on x86_64-apple-darwin15.
I have updated the wiki ABI cleanup page.

FX


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