[13u] RFR: 8233019: java.lang.Class.isPrimitive() (C1) returns wrong result if Klass* is aligned to 32bit

[Andrew Brygin]

Hello,

 I would like to backport a fix for JDK-8233019 to jdk13u:

Bug: https://bugs.openjdk.java.net/browse/JDK-8233019
Original change: http://hg.openjdk.java.net/jdk/jdk/rev/9bbe560e8131
Webrebv: http://cr.openjdk.java.net/~bae/13u/8233019/webrev.00/

 The original change applies cleanly, except two files where a little
context update is required due to absence of the fix for JDK-8230505:

src/hotspot/cpu/s390/c1_LIRAssembler_s390.cpp:
<        } else if (is_reference_type(c->type())) {
---
>        } else if (c->type() == T_OBJECT || c->type() == T_ARRAY) {

src/hotspot/cpu/x86/c1_LIRAssembler_x86.cpp:
<        } else if (is_reference_type(c->type())) {
---
>        } else if (c->type() == T_OBJECT || c->type() == T_ARRAY) {

The change tested on linux x86_64 with tier1 and supplied regression test.

Thanks,
Andrew