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

Co-authored-by: Aleksey Shipilev <shade@openjdk.org>
Reviewed-by: shade, ihse

make/hotspot/lib/CompileJvm.gmk

@@ -94,6 +94,8 @@ DISABLED_WARNINGS_clang := ignored-qualifiers sometimes-uninitialized \
 ifneq ($(DEBUG_LEVEL), release)
   # Assert macro gives warning
   DISABLED_WARNINGS_clang += tautological-constant-out-of-range-compare
+  # Some reasonable asserts produce warnings on GCC <= 7
+  DISABLED_WARNINGS_gcc += strict-overflow
 endif
 
 DISABLED_WARNINGS_xlc := tautological-compare shift-negative-value