[PATCH] Fix PR17546

[Michael Liao]

Hi

The attached patch fixes PR17546. The root cause is that the assertion
is too strong as the index type used in
extract_vector_elt/insert_vector_elt is supposed to be
TLI.getVectorIdxTy() which is a pointer type on most targets. On 64-bit
target with <N x i32> vector element extraction, it's a legal case with
32-bit mask element but 64-bit vector index. This patch fixes that by
truncating or zero-extending that index into mask element type. As that
truncation or zero-extending will be translated into subreg in most
time. It won't generate additional code compared to previous code.

Thanks for review
- Michael 
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