Bug#907363: src:mozjs52: FTBFS on i386: various test failures

[Tim Lunn]

Package: src:mozjs52
Version: 60.1.0-1
Severity: normal

I ran a test build of Spidermonkey 60.1.0-1 on the Ubuntu ppa builders and had the following test failures:

## non262/Date/timeclip.js: rc = 3, run time = 0.048487
747197: TimeClip behavior for very large numbers
non262/Date/timeclip.js:19:1 Error: Assertion failed: got true, expected false
Stack:
  @non262/Date/timeclip.js:19:1
TEST-UNEXPECTED-FAIL | non262/Date/timeclip.js | (args: "") [0.0 s]
{"action": "test_start", "pid": 20462, "source": "jstests", "test": "non262/Date/timeclip.js", "thread": "main", "time": 1535249793.461725}
{"action": "test_end", "extra": {"jitflags": []}, "pid": 20462, "source": "jstests", "status": "FAIL", "test": "non262/Date/timeclip.js", "thread": "main", "time": 1535249793.510212}

## test262/language/types/number/S8.5_A2.1.js: rc = 3, run time = 0.04355
uncaught exception: Test262Error: #1: var x = 9007199254740994.0; var y = 1.0 - 1/65536.0; var z = x + y; var d = z - x; d === 0. Actual: 2
TEST-UNEXPECTED-FAIL | test262/language/types/number/S8.5_A2.1.js | (args: "") [0.0 s]
{"action": "test_start", "pid": 20462, "source": "jstests", "test": "test262/language/types/number/S8.5_A2.1.js", "thread": "main", "time": 1535249586.113185}
{"action": "test_end", "extra": {"jitflags": []}, "pid": 20462, "source": "jstests", "status": "FAIL", "test": "test262/language/types/number/S8.5_A2.1.js", "thread": "main", "time": 1535249586.156735}

## test262/language/types/number/S8.5_A2.2.js: rc = 3, run time = 0.044356
uncaught exception: Test262Error: #1: var x = 9007199254740994.0; var y = 1.0 - 1/65536.0; var z = x + y; var d = z - x; d !== 2
TEST-UNEXPECTED-FAIL | test262/language/types/number/S8.5_A2.2.js | (args: "") [0.0 s]
{"action": "test_start", "pid": 20462, "source": "jstests", "test": "test262/language/types/number/S8.5_A2.2.js", "thread": "main", "time": 1535249586.0153189}
{"action": "test_end", "extra": {"jitflags": []}, "pid": 20462, "source": "jstests", "status": "FAIL", "test": "test262/language/types/number/S8.5_A2.2.js", "thread": "main", "time": 1535249586.059675}

full logs:
https://launchpadlibrarian.net/385368114/buildlog_ubuntu-cosmic-i386.mozjs60_60.1.0-ppa1_BUILDING.txt.gz

upstream bug report:
https://bugzilla.mozilla.org/show_bug.cgi?id=1486328