tools: use '/usr/bin/env python' instead of '/usr/bin/python'

* This is how it is done in other scripts in the AOSP tree, as
  '/usr/bin/python' may be python3 on some distros, which isn't
  supported yet.

Change-Id: I0d9857fc6a122f505953fddcd6244dad75b1838a
Unsafe.compareAndSwapInt()/Object() intrinsics for x86.

Bug: 11391018
Change-Id: I0a97375103917b0e9e20f199304c17a7f849c361
Merge "Unsafe.compareAndSwapInt()/Object() intrinsics for x86."
Merge "tools: use '/usr/bin/env python' instead of '/usr/bin/python'"
Fix incorrect IsHeapAddress in jni entrypoints.

The behaviour of IsHeapAddress had changed in the compaction CL
to not include nullptr as a valid heap address.

Bug: 11982013
Change-Id: I2847f71ca6775210ea4de8ede8b9ee8c14c55228
Merge "Fix incorrect IsHeapAddress in jni entrypoints."
Fix stack trace for proxy methods and added test case.

Bug: 11861564

Change-Id: I9513359ff9e5d345ee71d84388afed02bd114ecf
Merge "Fix stack trace for proxy methods and added test case."