Failure to make snapshot in debug mode on MIPS was caused by bad
floating point register allocation for function parameters. According to
MIPS convention, floating point parameters  cannot be stored on odd
numbered floating point register. Which was the case (f7 was allocated).
This patch ensures that f12 and f14 are used for storing fp parameters.

To be able to determine types of parameters in InitializePlatformSpecific
method, InitializePlatformIndependent has to be executed first.
InitializePlatformIndependent requires number of parameters in arguments.
That is the reason for changing definitions of CompareDescriptor and
BinaryDescriptor classes.

Change-Id: I7d723e03385f756114df60e33798400e97d99d8f
Reviewed-on: https://chromium-review.googlesource.com/c/1400415Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Predrag Rudic <prudic@wavecomp.com>
Cr-Commit-Position: refs/heads/master@{#58768}