Programming Languages Research Group: Git

Don't try to use the malloc_usable_size portability implementation if we have JEMalloc

Summary:
This is only an issue for the OSS HHVM build on OSX, where we have JEMalloc headers included directly.
In the OSS HHVM build, we define `USE_JEMALLOC` globally if we have JEMalloc, so gate the portability implementation behind that.

Reviewed By: mzlee

Differential Revision: D3237449

fb-gh-sync-id: 07cf9b31114723ffd9f2b29cf449bee0ed8f5703
fbshipit-source-id: 07cf9b31114723ffd9f2b29cf449bee0ed8f5703

author	Christopher Dykes <cdykes@fb.com>
	Mon, 2 May 2016 19:22:28 +0000 (12:22 -0700)
committer	Facebook Github Bot 3 <facebook-github-bot-3-bot@fb.com>
	Mon, 2 May 2016 19:35:19 +0000 (12:35 -0700)
commit	8d4965cabcb41ab0ca804298807168d70e5da92b
tree	c628e233a3e6bb08aeeaafa872542b9d1fc505c5	tree \| snapshot
parent	a0a4a68dc876804f283131b5394610c556b67547	commit \| diff

folly/portability/Malloc.cpp		diff \| blob \| history
folly/portability/Malloc.h		diff \| blob \| history