RFR: 8367325: [s390x] build failure due to JDK-8361376

[Amit Kumar]

Fixes the SIGLL caused after [JDK-8361376](https://bugs.openjdk.org/browse/JDK-8361376). 

Issue was with `cs` instruction, which requires the address to be aligned. And after this change address at which operating was not aligned.

Wisdom from Principle of Z Operations: 

Sytax: CS R<sub>1</sub>,R<sub>3</sub>,D<sub>2</sub>(B<sub>2</sub>)

Sytax: CSY R<sub>1</sub>,R<sub>3</sub>,D<sub>2</sub>(B<sub>2</sub>)

`
The second operand of COMPARE AND SWAP (CS, CSY) must be designated on a word boundary.
`



=> 0x3fffc3149ba <_ZN17BarrierSetNMethod15set_guard_valueEP7nmethodii+266>: cs %r1,%r4,0(%r3)
(gdb) i r r3
r3             0x3ffe500017a       4397593526650
(gdb) p ($r3 % 8) 
$5 = 2
(gdb) si 

Thread 16 "C1 CompilerThre" received signal SIGILL, Illegal instruction.
NativeMethodBarrier::set_guard_value (bit_mask=2147483647, value=1, this=0x3ffe5000166)
    at /home/amit/jdk/src/hotspot/cpu/s390/gc/shared/barrierSetNMethod_s390.cpp:74
74         if (v == old_value) break;

-------------

Commit messages:
 - build fix

Changes: https://git.openjdk.org/jdk/pull/27213/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27213&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367325
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27213.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27213/head:pull/27213

PR: https://git.openjdk.org/jdk/pull/27213