RFR: 8295435: Build failure with GCC7 after JDK-8294314 due to strict-overflow warnings

[Jie Fu]

Hi all,

Let's disable `-Werror=strict-overflow` to get it build with gcc7 on Linux/x86.

bytecodeAssembler.cpp
instanceKlass.cpp
klassVtable.cpp


Thanks.
Best regards,
Jie

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Commit messages:
 - 8295435: Build failure with GCC7 after JDK-8294314 due to strict-overflow warnings

Changes: https://git.openjdk.org/jdk/pull/10738/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10738&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295435
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10738.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10738/head:pull/10738

PR: https://git.openjdk.org/jdk/pull/10738