Add config and host platform headers in runtime_primitives

Only track whether we're on an 32- or 64-bit x86 host and set frame size
depending on host platform. Use the new config in runtime_library
assembly functions rather than hard-coded constants.

Bug: 232598137, 278926583
Test: mm && berberis_host_tests
Change-Id: I1e484b0f6d648d07887a7b257e9be5a014806251
3 files changed