[mips][turbofan] Pass the slot index for the Peek instruction by operand
This is the implementation of crrev.com/c/866721 for mips and mips64. Drive-by change: I made the slot index calculation on mips the same as on mips64. Original description: At the moment the slot index is encoded in the opcode. This, however, sets an upper limit the slot index which is lower than what we want to have (i.e. < 512). With this change we pass the slot index as an immediate operand, which does not impose limits on the value it contains. R=v8-mips-ports@googlegroups.com Change-Id: I46219b07962eadd174f418cba1ea38b07f9b5e96 Reviewed-on: https://chromium-review.googlesource.com/866723 Commit-Queue: Andreas Haas <ahaas@chromium.org> Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com> Cr-Commit-Position: refs/heads/master@{#50719}
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