Summary: Add a use of the node cx to avoid it being destroyed.
Backport from JDK-8217359: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8217359
This patch of OpenJDK is available here: https://hg.openjdk.java.net/jdk/jdk12/rev/44f41693631f

Test Plan: test/compiler/c2/Test8217359.java

Reviewed-by: luchsh, kuaiwei

Issue: https://github.com/alibaba/dragonwell8/issues/11

Summary: Prevent downgraded compilation tasks from recompiling.
Reviewed-by: sgehwolf, thartmann, andrew

Summary: Includes compile_id addition from JDK-8054492
Reviewed-by: andrew

Summary: Avoided collecting unaligned stores in Initialize node by making can_capture_store return false for same
Reviewed-by: dlong, kvn, vlivanov

8180904: Hotspot tests running with -agentvm failing due to classpath
Summary: Add -cp System.getProperty("java.class.path") to ProcessBuilder arguments.
Reviewed-by: sla, gtriantafill

Reviewed-by: neliasso, kvn

Reviewed-by: kvn

8172850: Anti-dependency on membar causes crash in register allocator due to invalid instruction scheduling
Summary: Regression test and additional asserts. The problem is fixed by 8087341.
Reviewed-by: kvn

Reviewed-by: kvn

Summary: Replace shell script with Java-only code
Reviewed-by: kvn, iignatyev

Reviewed-by: kvn
Contributed-by: vaibhav.x.choudhary@oracle.com

Reviewed-by: kvn

Summary: Bailout if OSR entry is unreachable.
Reviewed-by: thartmann
Contributed-by: NAndreas Woess <andreas.woess@oracle.com>

Summary: Change TypeF:eq and TypeD:eq to compare NaN values using a bitwise comparison.
Reviewed-by: kvn
Contributed-by: NStefan Anzinger <stefan.anzinger@oracle.com>

Summary: C1 intrinsics for System.nanoTime(), System.currentTimeMillis() and JVM.counterTime() should be pinned.
Reviewed-by: kvn, vlivanov, iveresov

Reviewed-by: kvn

Summary: C1 intrinsics for System.nanoTime(), System.currentTimeMillis() and JVM.counterTime() should be pinned.
Reviewed-by: kvn, vlivanov, iveresov

8173373: C1: NPE is thrown instead of LinkageError when accessing inaccessible field on NULL receiver
Summary: Deoptimize if receiver null check of unresolved field access fails to throw NoClassDefFoundError instead of NPE.
Reviewed-by: vlivanov

Summary: Require equal bases when unaliasing offsets for raw accesses
Reviewed-by: thartmann, kvn

Reviewed-by: kvn

Reviewed-by: kvn

Reviewed-by: vlivanov

Summary: made 8027631 first arg skip applicable to not inlined virtual callsite too.
Reviewed-by: kvn, jcm

Reviewed-by: kvn, thartmann

Reviewed-by: kvn, thartmann

Reviewed-by: kvn, thartmann

Summary: fixed the jvms for callsite traps based on declared signature.
Reviewed-by: jcm, coleenp, vlivanov

Summary: fixed the jvms for callsite traps based on declared signature.
Reviewed-by: jcm, coleenp, vlivanov

8204966: [TESTBUG] hotspot/test/compiler/whitebox/IsMethodCompilableTest.java test fails with -XX:CompileThreshold=1
Summary: enforce lower bound on number of loop iterations used to trigger OSR
Reviewed-by: kvn, iignatyev

Summary: don't convert loop with safepoint on the backedge to Counted loop
Reviewed-by: kvn

Reviewed-by: kvn
Contributed-by: NXiang Yuan &lt;xiang.yuan@linaro.org&gt;, Zoltan Majo <zoltan.majo@oracle.com>

Summary: Need to specify /othervm in annotation section if jvm command line option -Xbatch is specified.
Reviewed-by: kvn

Summary: Correct backport of 8159244.
Reviewed-by: kvn

Summary: Fixed string comparison and indentation
Reviewed-by: kvn

Reviewed-by: kvn

Summary: don't convert loop with safepoint on the backedge to Counted loop
Reviewed-by: kvn

Summary: Emit release barrier after String creation to prevent partially initialized object from escaping.
Reviewed-by: kvn

Summary: C2 treats x^2 as a special case and computes x * x while the interpreter and c1 don't have special case code for X^2.
Reviewed-by: kvn

Summary: Emit release barrier after String creation to prevent partially initialized object from escaping.
Reviewed-by: kvn

Reviewed-by: kvn