hg: jdk8u/jdk8u-dev: 8210416: [linux] Poor StrictMath performance due to non-optimized compilation

[sgehwolf at redhat.com]

Changeset: 3a2c8d0a600d
Author:    sgehwolf
Date:      2019-04-29 14:23 +0200
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/rev/3a2c8d0a600d

8210416: [linux] Poor StrictMath performance due to non-optimized compilation
Summary: Compile fdlibm with -O3 and relevant C flags on gcc arches.
Reviewed-by: mbaesken, andrew

! common/autoconf/flags.m4
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in