package: bump dependencies
lib: port to heap.js@0.7.1
platform: remove checkMap/ instructions and stubs
platform: move stub type into input
stubs: use `options` instead of `locals` arg
platform: generalize stubs
platform: rename CFGStub to just Stub
base: move stubs code to base.js

* Stub out IC generation
platform: allow overriding stub in x64
platform: simplify object allocation
package: update heap.js
stubs: split property ops into slot + store
ic: stub out IC
ic: more code
instructions: unify beginProc and proc
compiler: allocate spills in IC too
ic: implement GetPropertySlot IC
x64: align call sites to make them smis
instructions: use .tainted
compiler: disasm tracing