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8c: skip 64-bit regpair allocation for OINDEX nodes in cgen64()

OINDEX can only return TLONG result on 386 so give it
a register instead of a regpair and let gmove() handle
the conversion.

--- a/sys/src/cmd/8c/cgen64.c

+++ b/sys/src/cmd/8c/cgen64.c

@@ -2526,7 +2526,7 @@

 	case OCAST:

 		l = n->left;

 		if(typev[l->type->etype]) {

-			if(!vaddr(l, 1)) {

+			if(!vaddr(l, 1) && l->op != OINDEX) {	// theres no 64 bit indexing

 				if(l->complex + 1 > nn->complex) {

 					d = regpair(Z, l);

 					sugen(l, d, 8);