Retry mount() if it fails with EINTR

mount() may fail EINTR, and when it does this causes dalvik to crash.
Use the regular retry macro to avoid these problems.

Change-Id: I436fe4f0fab36c8172b43b8b9caedcb6d8167a4f
Revert "GC triggering performance optimizations"

This reverts commit d2921b706191705eb3e3efd83c51a7078207fe86.

Conflicts:
	vm/alloc/HeapSource.cpp