Use -no_compact_unwind when creating dylibs on Mac.

Use -no_compact_unwind when creating dylibs on Mac.

Instructs the linker not to attempt generating _eh_frame from the DWARF info, avoiding warnings like

R=vegorov@google.com

ld: warning: could not create compact unwind for _kDartVmSnapshotInstructions: register saved more than once (might be shrink wrap)
Committed: https://github.com/dart-lang/sdk/commit/21e9a4fc650bb77ac5b28614f7e28c57a1cbc926

[rmacnak, 2017-03-30 19:42:00]

rmacnak@google.com changed reviewers:
+ vegorov@google.com

[rmacnak, 2017-03-30 19:44:00]

On 2017/03/30 19:42:00, rmacnak wrote:

(The iOS arm64 linker does not product such warnings.)

[Vyacheslav Egorov (Google), 2017-03-31 10:32:07]

lgtm

[rmacnak, 2017-03-31 20:37:13]

Description was changed from

==========
Use -no_compact_unwind when creating dylibs on Mac.

Instructs the linker not to attempt generating _eh_frame from the DWARF info,
avoiding warnings like

ld: warning: could not create compact unwind for _kDartVmSnapshotInstructions:
register saved more than once (might be shrink wrap)
==========

to

==========
Use -no_compact_unwind when creating dylibs on Mac.

Instructs the linker not to attempt generating _eh_frame from the DWARF info,
avoiding warnings like

R=vegorov@google.com

ld: warning: could not create compact unwind for _kDartVmSnapshotInstructions:
register saved more than once (might be shrink wrap)
Committed:
https://github.com/dart-lang/sdk/commit/21e9a4fc650bb77ac5b28614f7e28c57a1cbc926
==========

[rmacnak, 2017-03-31 20:37:15]

Committed patchset #1 (id:1) manually as
21e9a4fc650bb77ac5b28614f7e28c57a1cbc926 (presubmit successful).