To make the comparison meaningful, better compare integrals rather
than strings.
Test: ./stack_core.py
Change-Id: Ie24bea75d7c0bc57a1b7683b91e62fafead70341
x86 uses the x86_64 toolchain. There's no separate 32-bit toolchain.
I started to refactor so we could add FindToolchain tests, but that doesn't
work because FindToolchain depends on environment variables set up by 'lunch'.
Change-Id: I264b95e1e83a7e795f8cac49bc9e1cf497514029