RFR (XS) 8233695: AArch64 build failures after -Wno-extra removal

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8233695

Fix:
  https://cr.openjdk.java.net/~shade/8233695/webrev.01/

This is the simplest fix I can think of in orderAccess: cast away constness. Also, trivially unused
parameter in templateInterpreterGenerator_aarch64.cpp. The issues is exposed in 14, but it is
actually there in all releases down to 8-aarch64.

Testing: aarch64 build, tier1 (running)

-- 
Thanks,
-Aleksey