getMemberExpressionInfo allocated three arrays (members, optionals, ranges)
for every member expression before checking the root, but ~77% of calls
reject because the root is not a tracked variable. Add getMemberExpressionRoot
to resolve the root without allocating and only build the arrays on the
accepted path.

Collapse the callHooksForName/callHooksForInfo wrappers onto a shared
_callHooksForInfo core that takes the args array directly, so each call
collects the rest arguments once instead of through several forwarding layers.

Measured over the three.js source tree (walk phase): ~44% fewer bytes
allocated per pass and ~6-8% faster versus the previous baseline.

The ident handler in _preWalkVariableDeclaration only depends on the
loop-invariant hookMap, so build it once per declaration instead of once
per declarator.

…ling

Add a fast path in _preWalkVariableDeclaration for plain identifier
declarations (the common `const x =` form) that skips the enterPattern
dispatch and avoids the per-declaration onIdent closure, which is only
created now when a destructuring pattern is present.

Reuse a single instance-bound defineVariable callback for enterPatterns
instead of allocating an identical closure on every function/class/block
scope entry.

Walk phase over three.js: ~4-5% faster with no behavior change.

Gate the CALL-type getMemberExpressionInfo in walkCallExpression on a cheap
root check: it only yields a result for call-rooted chains (a().b()), which
is ~0.6% of member callees, so the common identifier/this-rooted callee now
skips the lookup. Also read the directive literal once in detectMode and use
an indexed loop in enterPatterns.

…mbers

tapEvaluateWithVariableInfo only populated its single-entry cache when getInfo
returned a result, so every member expression that failed variable resolution
recomputed getMemberExpressionInfo in both the default and stage-100 evaluate
taps. Cache the result unconditionally so the second tap reuses it, removing
~18% of getMemberExpressionInfo calls on three.js with no extra retained state.