The x86-64 call instruction only supports 32-bit IP-relative direct
calls or 64-bit indirect calls. So handle 64-bit direct calls by
storing the value into a register and making an indirect call.

Bug chromium:860533

Change-Id: I3781d1e8a489ce9ab7c17b098ffe830cae62477e
Reviewed-on: https://swiftshader-review.googlesource.com/19828Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>