Change build.py to be like ninja.py and only use a single GN/Ninja invocation to cross-build the SD…

Change build.py to be like ninja.py and only use a single GN/Ninja invocation to cross-build the SDK. This step alone would fix #29580. This breaks cross-building the SDK with GYP.

Remove hack in bin/snapshot_utils.cc that avoided building a true app-jit snapshot for ARM, ARM64 and MIPS because of the multiple invocations above.

Add GN flags to choose to build script snapshots instead of app-jit snapshots, avoiding a slow training run inside a simulator.

Fixes #29580.

R=zra@google.com

Committed: https://github.com/dart-lang/sdk/commit/98d31056a79a40bca4590b429bc8e9e3ab766e69

[rmacnak, 2017-05-08 18:31:19]

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

[zra, 2017-05-08 19:30:58]

lgtm

[rmacnak, 2017-05-08 20:06:14]

Description was changed from

==========
Change build.py to be like ninja.py and only use a single GN/Ninja invocation to
cross-build the SDK. This step alone would fix #29580. This breaks
cross-building the SDK with GYP.

Remove hack in bin/snapshot_utils.cc that avoided building a true app-jit
snapshot for ARM, ARM64 and MIPS because of the multiple invocations above.

Add GN flags to choose to build script snapshots instead of app-jit snapshots,
avoiding a slow training run inside a simulator.

Fixes #29580.
==========

to

==========
Change build.py to be like ninja.py and only use a single GN/Ninja invocation to
cross-build the SDK. This step alone would fix #29580. This breaks
cross-building the SDK with GYP.

Remove hack in bin/snapshot_utils.cc that avoided building a true app-jit
snapshot for ARM, ARM64 and MIPS because of the multiple invocations above.

Add GN flags to choose to build script snapshots instead of app-jit snapshots,
avoiding a slow training run inside a simulator.

Fixes #29580.

R=zra@google.com

Committed:
https://github.com/dart-lang/sdk/commit/98d31056a79a40bca4590b429bc8e9e3ab766e69
==========

[rmacnak, 2017-05-08 20:06:15]

Committed patchset #1 (id:1) manually as
98d31056a79a40bca4590b429bc8e9e3ab766e69 (presubmit successful).