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Hexagon inline asm: add reg_pair, vreg, vreg_pair, and qreg register classes Add three new register classes for the Hexagon inline assembly backend: * `reg_pair`: GPR double registers (r1:0 through r27:26) * `vreg`: HVX vector registers (v0-v31) * `qreg`: HVX predicate registers (q0-q3), clobber-only for now
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.