hg: jdk/sandbox: 8245051: c1 is broken if it is compiled by gcc without -fno-lifetime-dse

[chris.hegarty at oracle.com]

Changeset: 497fd9f9129c
Author:    xliu
Date:      2020-05-20 11:29 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/497fd9f9129c

8245051: c1 is broken if it is compiled by gcc without -fno-lifetime-dse
Summary: Initialize BlockBegin block id in constructor rather than operator new
Reviewed-by: kbarrett, thartmann

! src/hotspot/share/c1/c1_Instruction.hpp
! src/hotspot/share/c1/c1_ValueMap.cpp