RFR: 8263352: assert(use == polladr) failed: the use should be a safepoint polling

[Wang Huang]

The main reason of this failure has been shown in JDK-8263352.
In this patch, I will give a small test case called `Test8263352.java` to reproduct this failure.
Thanks to @vnkozlov , who found this failure for the first time (to me).
Thanks to  @nsjian，who found the case which can reproduct this failure everytime.
Thanks to @pfustc, who changed notes with us.

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Commit messages:
 - 8263352: assert(use == polladr) failed: the use should be a safepoint polling

Changes: https://git.openjdk.java.net/jdk/pull/3061/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3061&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263352
  Stats: 85 lines in 2 files changed: 77 ins; 5 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3061.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3061/head:pull/3061

PR: https://git.openjdk.java.net/jdk/pull/3061