Sanjay Patel 8ae0800ae1 [x86] reassociate integer multiplies using machine combiner pass
Add i16, i32, i64 imul machine instructions to the list of reassociation
candidates.

A new bit of logic is needed to handle integer instructions: they have an
implicit EFLAGS operand, so we have to make sure it's dead in order to do
any reassociation with integer ops.

Differential Revision: http://reviews.llvm.org/D11660



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243756 91177308-0d34-0410-b5e6-96231b3b80d8
2015-07-31 16:21:55 +00:00
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