[DAG] Teach DAG to also reassociate vector operations

Description

[DAG] Teach DAG to also reassociate vector operations

This commit teaches DAG to reassociate vector ops, which in turn enables
constant folding of vector op chains that appear later on during custom lowering
and DAG combine.

Reviewed by Andrea Di Biagio

Details

Committed
ributzkaJan 13 2014, 12:51 PM
Parents
rL199134: This is a macosx specific test case for stepping & setting breakpoints on…
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