* The state would be recomputed even with the keepSnapshot flag
* (experimental) Disable the lookup cache

This reverts commit fdd8254.

update to llvm 12

Constants which are symbols are interpreted as variable lookups by eval
and therefore must be quoted.

prevent fetch-llvm from re-downloading file

trying to work around CI timeouts and crashes

Try avoiding unnecessary analysis state recomputation

Speculatively inline promise code for builtins in RIR.

if we move an environment over a PushContext we need to update its
context offset field, or it will register itself to the wrong context.
E.g.

    e1 = mkenv context 1
         PushContext ... e2
         Checkpoint ....

if we move `e1` into the checkpoint, then the context must be increased
to 2, otherwise it will override the environment `e2` in the inlined
context.

* Run ASan and UBsan and fix issues

Finally I found out how to run the sanitizers from clang.

This commit fixes a ton of memory leaks, UB and memory errors. The
alignment sanitizer is still broken and thus disabled for now.

…onEnv

ensure that when moving environments the context position is updated

shrink the size of Instructions

because we want to target them with match_call_args now

…forces

convert uses the to-type to determine the type of the box, but we need
the from type here...

the first checkpoint of the inlinee can be replaced by the last
checkpoint of the caller. This fixes many regressions.

[wip] some static usemethod support

since runtime objects do not have their dtrs called, we cannot use
C++ objects as members...

Avoid recompilation

…vement

try to ensure that speculation gets placed before and not after noop …

files.