rustc: Ensure FNV hashing is inlined across crates

Right now the primary hashing algorithm of the compiler isn't actually inlined
across crates, meaning that it may be missing out on some crucial optimizations
in a few places (perhaps unrolling smaller loops, etc).

This commit made the hashing function disappear from a profiled version of the
compiler, but that's likely because it was just inlined elsewhere. When
compiling winapi, however, this decreased compile time from 18.3 to 17.8 seconds
(a 3% improvement).

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