[LegalizeTypes] Add SoftenFloatRes_FREEZE

Summary: This adds SoftenFloatRes_FREEZE.

Reviewers: bkramer, JamesNagurne, craig.topper, efriedma

Reviewed By: craig.topper

Subscribers: AbigailLinden, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76980