hg: jdk/sandbox: 8249165: Remove unneeded nops introduced by 8234160 changes

[chris.hegarty at oracle.com]

Changeset: c6fe28c7fd94
Author:    kvn
Date:      2020-07-13 16:41 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/c6fe28c7fd94

8249165: Remove unneeded nops introduced by 8234160 changes
Summary: Check for branch instruction at the end of code block
Reviewed-by: vlivanov

! src/hotspot/cpu/x86/c2_intelJccErratum_x86.cpp
! src/hotspot/cpu/x86/c2_intelJccErratum_x86.hpp
! src/hotspot/cpu/x86/x86.ad