Summary:
Add patterns for doing floating point round with various rounding modes
followed by conversion to int as a single FCVT* instruction.
Reviewers: t.p.northover, jmolloy
Subscribers: aemerson, rengolin, mcrosier, llvm-commits
Differential Revision: http://reviews.llvm.org/D11424
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243422 91177308-0d34-0410-b5e6-96231b3b80d8
