This patch introduces a VPInstructionToVPRecipe transformation, which
allows us to generate code for a VPInstruction based VPlan re-using the
existing infrastructure.

Reviewers: dcaballe, hsaito, mssimpso, hfinkel, rengolin, mkuper, javed.absar, sguggill

Reviewed By: dcaballe

Differential Revision: https://reviews.llvm.org/D46827

llvm-svn: 334969

Reviewers: dcaballe, hsaito, mkuper, hfinkel

Reviewed By: dcaballe

Differential Revision: https://reviews.llvm.org/D48081

llvm-svn: 334951

Reviewers: dcaballe, mkuper, hfinkel, hsaito, mssimpso

Reviewed By: dcaballe

Differential Revision: https://reviews.llvm.org/D48080

llvm-svn: 334933