[PATCH] Fix the failure exposed by checking constant integer argument range

[Jiangning Liu]

Hi,

Attached patches are to fix the failure exposed by checking constant
integer argument range.

The LowerVECTOR_SHUFFLE is to cover the following two cases,
1) the 1st operand of VDUPlane is EXTRACT_SUBVECTOR
2) the 1st operand of VDUPlane is CONCAT_VECTORS, for which the 2nd operand
is UNDEF.

The EXTRACT_SUBVECTOR and CONCAT_VECTORS can be optimized away accordingly,
so the patterns defined in .md file can be simplified. Some of the useless
patterns are removed as well.

In front-end, the constant int range checking is fixed, and added more test
cases to cover both the upbound and lowbound values.

-- 
Thanks,
-Jiangning
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