s390: [heap] Pass isolate to the OOM handler and add an OOM test.

Port 28190980

Original Commit Message:

    This patch also moves Shell::Exit to base::OS::ExitProcess.

R=ulan@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I0a7dc051ed5a21ad9641d1d05182ea4240bc666a
Reviewed-on: https://chromium-review.googlesource.com/976332Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52164}

src/s390/assembler-s390.cc

@@ -2130,7 +2130,7 @@ void Assembler::GrowBuffer(int needed) {
   // Some internal data structures overflow for very large buffers,
   // they must ensure that kMaximalBufferSize is not too large.
   if (desc.buffer_size > kMaximalBufferSize) {
-    V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
+    V8::FatalProcessOutOfMemory(nullptr, "Assembler::GrowBuffer");
   }
 
   // Set up new buffer.