RFR: 8266773: Release VM is broken with GCC 9 after 8214237 [v3]

[Jie Fu]

> Hi all,
> 
> Release VM is broken with GCC 9 due to -Werror=format-overflow=.
> And if this assert[1] is removed, fastdebug VM can also reproduce the same bug.
> The key to reproduce it is to compile with -O3.
> 
> IMO, it seems like a false positive gcc bug.
> But we'd better fix it since gcc 9 is assumed to be supported to build OpenJDK.
> 
> Thanks.
> Best regards,
> Jie
> 
> 
> [1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp#L47

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  Use the fixed indentation spaces in the format string

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3941/files
  - new: https://git.openjdk.java.net/jdk/pull/3941/files/0561a9c4..11ec4423

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3941&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3941&range=01-02

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3941.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3941/head:pull/3941

PR: https://git.openjdk.java.net/jdk/pull/3941