Like the Cocoa port in 261087@main we can arrange to call malloc_trim (if the libc has the function) in the GTK and WPE ports inside WebProcess::releaseSystemMallocMemory()
Pull request: https://github.com/WebKit/WebKit/pull/13145
Committed 263373@main (4d11cf4168d7): <https://commits.webkit.org/263373@main> Reviewed commits have been landed. Closing PR #13145 and removing active labels.
<rdar://problem/108506570>