tcg-ppc64: Fold constant call address into descriptor load
Eliminates one insn per call:
: lis r2,4165
-: ori r2,r2,59616
-: ld r0,0(r2)
+: ld r0,-5920(r2)
: mtctr r0
-: ld r2,8(r2)
+: ld r2,-5912(r2)
: bctrl
Signed-off-by: NRichard Henderson <rth@twiddle.net>
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