Allocation folding tests are failing in debug mode, since the change
https://codereview.chromium.org/1972553002 (6e15433d) introduced a debug check in
lithium-codegen-mips64.cc, line 5287.

Reason for failure is to be found in https://codereview.chromium.org/1899813003 (61f5fbbb),
which is missing changes calling LFastAllocate in lithium-mips64.cc.

BUG=

Review-Url: https://codereview.chromium.org/1977833002
Cr-Commit-Position: refs/heads/master@{#36246}