CRASH (8.0.0) Travis MacOS build failing due to OOM

[abhinav92003]

MacOS build on Travis is failing: https://travis-ci.com/github/DynamoRIO/dynamorio/jobs/356471150. There seems to be some OOM issue causing malloc to fail.

DR Version: 8.0.18439. Latest build using HEAD also fails.
OS: OSX; macOS 10.14.6; osx_image: xcode11.3; Xcode version: Xcode 11.3.1
64 bit build

The failure seems to appear between #4339 and #4342, so it's not caused by us.

[derekbruening]

We think this is related to Travis giving us a Mac VM with XCode 9.4.1 and OSX 10.13, instead of the 11.3 and 10.4 we are requesting and which we had back in February.

I checked a few builds and it looks like Travis made some change which caused the regression between our #4149 and #4150 on Mar 1-2:

• i#4134: DrBBDup: basic block duplication #4140 11.3 Mar 1
• i#3917: Fix gcc 9.2.1 build errors #4149 11.3 Mar 1
• i#4083 func trace: Add func_view tool #4150 9.4 Mar 2

Strangely the regression did not cause the immediate return of the failures we moved to 10.14 for.

[abhinav92003]

Travis macOS builds have started passing again, of their own accord.

In #4354 I did an experiment where I reverted last 3 commits and re-committed them one at a time. These commits were failing on master when they were submitted.

Will close this issue. In a separate PR, I'll update xcode to our intended version as that is still useful.