Distinguish between host and device x86.

Studio doesn't know how many users they have who don't have SSSE3, which
is required in the Android *device* x86 ABI, but hasn't historically
been in the *host* ABI. Avoid upsetting an unknown number of users at
least while we collect data on how many are affected...

Bug: https://issuetracker.google.com/171235570
Test: objdump --disassemble | grep pshufb
Change-Id: I1734594fe89976383f10967f04b86466a5d4874e
1 file changed