Fix x86 linux tests build and run

Fix x86 linux tests build and run

[unix x86] Fix tests build
[unix x86] Add register map for crossgen2
            Fixes readytorun/coreroot_determinism/coreroot_determinism/coreroot_determinism.sh on x86 linux
[unix x86] Fix tail calls tests
[unix x86] Fix unmanaged callconv
[unix x86] Fix passing implicit args via stack
[unix x86] Pop hidden retbuff arg on cdecl callconv
[unix x86] Fix WriteBarrier call

[x86] Add calling convention name print to dump
[x86] Use ebx to pass VASigCookie to GenericPInvokeCalliHelper
            It fixes stack alignment in GenericPInvokeCalliHelper on unix x86

Fix storageType overflow assertion in TinyArray