RFR: 8274860: gcc 10.2.1 produces an uninitialized warning in sharedRuntimeTrig.cpp

[Joshua Cao]

Initialize `fq` to an array to zeroes.

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Commit messages:
 - 8274860: gcc 10.2.1 produces an uninitialized warning in sharedRuntimeTrig.cpp

Changes: https://git.openjdk.java.net/jdk/pull/6220/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6220&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274860
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6220.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6220/head:pull/6220

PR: https://git.openjdk.java.net/jdk/pull/6220