[8u] RFR: C1: possible overflow when strength reducing integer multiply by constant

[Aleksey Shipilev]

Original fix:
  https://bugs.openjdk.java.net/browse/JDK-8181872
  https://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/16c9c159df90

Patch applies cleanly, except that aarch64 and arm is not in 8u, so those hunks are ignored.

8u webrev:
  https://cr.openjdk.java.net/~shade/8181872/webrev.8u.01/

Testing: tier1, affected test (it passes even without the fix, probably because my toolchain does
not break it)

-- 
Thanks,
-Aleksey