8254793: [JVMCI] improve speculation encoding #667
I've updated this PR such that an encoded speculation value is always stored/transported in a long. The encoding still only uses 31 bits which means the instruction sequence emitted by Graal can still be optimized to a single store (e.g. on x86 a MOVESLQ can write a 32 bit value sign extended to a long into a long memory location).
@dougxc This change now passes all automated pre-integration checks.
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