Skip individual unit tests that are expensive for the PGO task

[nascheme]

BPO	37707
Nosy	@nascheme
PRs	bpo-37707: Exclude expensive unit tests from PGO task #15009 [3.8] bpo-37707: Exclude expensive unit tests from PGO task (GH-15009) #15024

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-07-30.18:12:56.420>
created_at = <Date 2019-07-29.18:34:07.203>
labels = ['type-feature', 'build']
title = 'Skip individual unit tests that are expensive for the PGO task'
updated_at = <Date 2019-07-30.18:34:48.942>
user = 'https://github.com/nascheme'

bugs.python.org fields:

activity = <Date 2019-07-30.18:34:48.942>
actor = 'nascheme'
assignee = 'none'
closed = True
closed_date = <Date 2019-07-30.18:12:56.420>
closer = 'nascheme'
components = ['Build']
creation = <Date 2019-07-29.18:34:07.203>
creator = 'nascheme'
dependencies = []
files = []
hgrepos = []
issue_num = 37707
keywords = ['patch']
message_count = 3.0
messages = ['348677', '348763', '348767']
nosy_count = 1.0
nosy_names = ['nascheme']
pr_nums = ['15009', '15024']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37707'
versions = []

[nascheme]

Add a new support decorator, @skip_if_pgo_task and then use it to mark test cases. I suspect the PGO task works well if it can exercise common code paths. Running long tests likely have rapidly diminishing benefits. The instrumented PGO executable runs quite a bit slower than a normal build and so it is useful to spend a bit of time to exclude expensive tests.

[nascheme]

New changeset 52a48e6 by Neil Schemenauer in branch 'master':
bpo-37707: Exclude expensive unit tests from PGO task (GH-15009)
52a48e6

[nascheme]

New changeset 382cb85 by Neil Schemenauer (Miss Islington (bot)) in branch '3.8':
bpo-37707: Exclude expensive unit tests from PGO task (GH-15009) (bpo-15024)
382cb85