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Add altivec support (smx, IBM Power 8)

Targeting open power arch, we start porting the inastemp simd class to altivec.

It is currently a work in progress.


* [x]   Manage load/store (especially not alligned)
* [x]   Manage little/big Indian (in the load/store and the signof)

* [x]  Build with XL compiler

See merge request !3

Update unit test (load store)

add a hard test for unaligned load/store

See merge request !7

Update cmake -- add flag to remove warning for unused parameters variables because they come from builtin functions

Update CMAKE --  add option to proceed clang and xl differently but still does not compile with clang

Update ALTIVEC -- Make the first unit tests correct - still load/store unoptimized and ifelse incorrect

Update unit test

add more tests from openpower evaluation

See merge request !6

Examples perfmodel



See merge request !5