RFR: 8265980: Fix systemDictionary and loaderConstraints printing

[Coleen Phillimore]

This is a trivial change to fix printing in PrintSystemDictionaryAtExit, see CR for more details.
Tested with tier1 on 5 Oracle-supported platforms and manually.

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Commit messages:
 - Remove obsolete assert and move loader_constraints into systemDictionary.cpp
 - 8265980: Fix systemDictionary and loaderConstraints printing

Changes: https://git.openjdk.java.net/jdk/pull/3696/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3696&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265980
  Stats: 34 lines in 6 files changed: 12 ins; 16 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3696.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3696/head:pull/3696

PR: https://git.openjdk.java.net/jdk/pull/3696