[Isolates] Allow running multiple isolates in shell and use this in tests.

[Isolates] Allow running multiple isolates in shell and use this in tests.

Sample usage (prints a sequence of mixed 1's and 2's):
  $ ./shell_g -e 'while (1) print(1)' --isolate -e 'while (1) print(2)'

The first group of source files (before the first --isolate) is run in
the default isolate. All the other groups are run in separate isolate
threads.

It would be nice to use our platform.h but it drags too many includes,
so I'm using pthreads on anything non-WIN32 for now.

Committed: http://code.google.com/p/v8/source/detail?r=5599

[yurys, 2010-10-06 14:52:58]

LGTM

http://codereview.chromium.org/3601010/diff/1/2
File samples/shell.cc (right):

http://codereview.chromium.org/3601010/diff/1/2#newcode98
samples/shell.cc:98: if (!ExecuteString(source, file_name, false, true)) {
This code can be extracted out of the if/else expression.

http://codereview.chromium.org/3601010/diff/1/2#newcode145
samples/shell.cc:145: void* IsolateThreadEntry(void* arg) {
This function can be made a private static method on SourceGroup.

http://codereview.chromium.org/3601010/diff/1/2#newcode190
samples/shell.cc:190: }
Should we delete isolate_sources before exit here?

http://codereview.chromium.org/3601010/diff/1/9
File tools/statics.whitelist (right):

http://codereview.chromium.org/3601010/diff/1/9#newcode3
tools/statics.whitelist:3: .*\.bss.*guard variable for v8::internal::MemCopy.*
are you sure you want to commit this?