[RFC] Adds a target hook

[Kugan Vivekanandarajah]

Adds a target hook TARGET_HW_MAX_MEM_READ_STREAMS. Loop unroller, if
defined, will try to limit the unrolling factor based on this.


gcc/ChangeLog:

2018-02-12  Kugan Vivekanandarajah  <kuganv@linaro.org>

    * doc/tm.texi.in (TARGET_HW_MAX_MEM_READ_STREAMS): Dcoument.
    * doc/tm.texi: Regenerate.
    * target.def (hw_max_mem_read_streams): New target hook.
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