Fix AVX OS support detection

Fix AVX OS support detection

In order to check for OS support for AVX, we need to add a check for the OSXSAVE bit in SetCpuInfo in the EEJItManager. In addition, the arch spec indicates that bits 0x6 of xcr0 (obtained by executing xgetbv instruction with ecx == 0) must be set. This fix adds both of these, although the CRT uses only the check of the two bits from SetCpuInfo.

(Change made by @CarolEidt)

[tfs-changeset: 1463578]