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This feature was very useful in the early days of the C API,
but has not shown usefuless for quite a while, and has a
significant maintenance burden, so it it's makes sense to
remove it now.
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Refactors most of the precompute pass's expression runner into its
base class so it can also be used via the C and JS APIs. Also adds
the option to populate the runner with known constant local and global
values upfront, and remembers assigned intermediate values as well
as traversing into functions if requested.
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Instead of using indices into the global interned type table. This
means that a lock is *never* needed to access an expanded Type. The
Type lock is now only acquired when a complex Type is created. On a
real-world wasm2js workload this improves wall clock time by 23% on my
machine with 72 cores and makes traffic on the Type lock entirely
insignificant.
**Before**
72 cores
real 0m6.914s
user 184.014s
sys 0m3.995s
1 core
real 0m25.903s
user 0m25.658s
sys 0m0.253s
**After**
72 cores
real 5.349s
user 70.309s
sys 9.691s
1 core
real 25.859s
user 25.615s
sys 0.253s
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Allows a user to enable/disable the `lowMemoryUnused` option and to get/set/clear arbitrary pass arguments when using the C- or JS-APIs.
* binaryen.**getLowMemoryUnused**(): `boolean`
* binaryen.**setLowMemoryUnused**(on: `boolean`): `void`
* binaryen.**getPassArgument**(key: `string`): `string | null`
* binaryen.**setPassArgument**(key: `string`, value: `string | null`): `void`
* binaryen.**clearPassArguments**(): `void`
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