This change makes possible to save and restore the FP registers
in the Prologue and Return parts for the CallAddress kind functions.

TEST=test-simplified-lowering/RunNumberDivide_2_TruncatingToUint32,
     test-simplified-lowering/RunNumberMultiply_TruncatingToUint32

Review URL: https://codereview.chromium.org/1191513003

Cr-Commit-Position: refs/heads/master@{#29378}