hg: jdk-updates/jdk15u: 8249165: Remove unneeded nops introduced by 8234160 changes

[vladimir.kozlov at oracle.com]

Changeset: 90050d1e36ef
Author:    kvn
Date:      2020-07-13 16:41 -0700
URL:       https://hg.openjdk.java.net/jdk-updates/jdk15u/rev/90050d1e36ef

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