test(asm): lock indirect-memory =*m rejection (Phase G prep)

Adds examples/1652-platform-asm-indirect-mem.sx exercising a `=*m -> @x`
indirect-memory place output. Currently rejected loudly at lowering
("not yet implemented"); this locks that behavior as a passing test.
The next commit implements indirect-memory outputs and flips this
example to run end-to-end (store-through-pointer → 42).

examples/expected/1652-platform-asm-indirect-mem.stdout

@@ -0,0 +1 @@
+