Don't use %p when generating disassembly in vm service.

Don't use %p when generating disassembly in vm service.

Evidentally it is platform dependent -- it seems to include the 0x
prefix on mac but not on windows.  I've switched to using %" Px "
instead.

This will fix bug 24038.

BUG=
R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/cc981c8246e28e21fe84b8ec00b7a2eac9719102

[turnidge, 2015-08-10 23:41:53]

turnidge@google.com changed reviewers:
+ johnmccutchan@google.com

[Cutch, 2015-08-10 23:50:02]

lgtm

[Ivan Posva, 2015-08-11 01:17:40]

iposva@google.com changed reviewers:
+ iposva@google.com

[Ivan Posva, 2015-08-11 01:17:40]

https://codereview.chromium.org/1282993002/diff/40001/runtime/vm/disassembler.cc
File runtime/vm/disassembler.cc (right):

https://codereview.chromium.org/1282993002/diff/40001/runtime/vm/disassembler...
runtime/vm/disassembler.cc:53: jsarr_.AddValueF("%" Px "", pc);
I don't think this is correct. As far as I know %p pads the number to pointer
size, which is not the case here. Do we need a Pd here?

[turnidge, 2015-08-11 18:22:59]

Committed patchset #4 (id:60001) manually as
cc981c8246e28e21fe84b8ec00b7a2eac9719102 (presubmit successful).