powerpc/bpf/jit: Optimize 64-bit Immediate loads
Similar to the LI32() optimization, if the value can be represented in 32-bits, use LI32(). Also handle loading a few specific forms of immediate values in an optimum manner. Acked-by: NAlexei Starovoitov <ast@kernel.org> Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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