hg: jdk/submit: 8217909: Make unused r12 register (without compressed oops) available to regalloc in C2

[roman at kennke.org]

Changeset: dd77459359c6
Author:    rkennke
Date:      2019-02-20 10:43 +0100
URL:       http://hg.openjdk.java.net/jdk/submit/rev/dd77459359c6

8217909: Make unused r12 register (without compressed oops) available to regalloc in C2

! src/hotspot/cpu/x86/c2_init_x86.cpp
! src/hotspot/cpu/x86/x86_64.ad
! src/hotspot/share/adlc/formsopt.hpp