a note about Symbol.typeSignature

No changes to behavior, just documenting internal workings of reflection
a bit more thoroughly, one step at a time.
Revert "synchronizes pendingVolatiles"

This reverts commit 000c18a8fac60065747652368dadcd7850532f3f,
because Symbol.isStable is independent from Type.isVolatile
since fada1ef6b315326ac0329d9e78951cfc95ad0eb0.
FromJavaClassCompleter is now flag-agnostic

A minor evolution of the notion of completion + also a small performance
optimization.
removes non-determinism in reflection-sync-potpourri

Depending on the environment in which the test is run, s1 can be either
“String” or “java.lang.String”. This is one of the known non-deterministic
behaviors of our reflection, caused by prefix stripping only working for
packages defined in the root mirror. Until we fix this, I suggest we make
the test more lenient.
SI-8131 fixes residual race condition in runtime reflection

Apparently some completers can call setInfo while they’re not yet done,
which resets the LOCKED flag, and makes anything that uses LOCKED to
track completion unreliable. Unfortunately, that’s exactly the mechanism
that was used by runtime reflection to elide locking for symbols that are
known to be initialized.

This commit fixes the problematic lock elision strategy by introducing
an explicit communication channel between SynchronizedSymbol’s and their
completers. Now instead of trying hard to infer whether it’s already
initialized or not, every symbol gets a volatile field that can be queried
to provide necessary information.
Scaladoc jars should go to /api.
Remove cruft from pom.

My understanding is distributionManagement is only needed to configure
maven locally for publishing. Since we do that it ant, getting rid of it.
SI-8170 Fix regression in TypeRef#transform w. PolyTypes

Regressed in SI-8046 / edc9edb7, by my hand.

At the time, I noticed the problem: transform wasn't accounting
for the potential Poly-Type-ness of its argument, and this would
lead to under-substituted types. The commit comment of edc9edb7
shows an example.

But the remedy wasn't the right one. The root problem is
that a TypeMap over a PolyType can return one with cloned
type parameter symbols, which means we've lose the ability
to substitute the type arguments into the result.

This commit detects up front whether the type-under-transform
is a PolyType with the current TypeRef's type parameters, and
just runs the `asSeenFrom` over its result type.
SI-7570 top-level codegen for toolboxes

Provides a way to inject top-level classes, traits and modules into
toolbox universes.

Previously that was impossible, because compile and eval both wrap their
arguments into an enclosing method of a synthetic module, which makes it
impossible to later on refer to any definitions from the outside.
SI-6411 reflection is now aware of posterasure

The `transformedType` method, which is used to bring Scala types to Java
world, was written in pre-valueclass times. Therefore, this method only
called transforms from erasure, uncurry and refChecks.

Now runtime reflection becomes aware of posterasure and as a consequence
methods, which have value classes in their signatures, can be called
without having to wrap them in catch-a-crash clause.

Another facet to this fix was the realization that value classes need
to be unwrapped, e.g. C(2) needs to be transformed to just 2, when they
are used naked in method signatures (i.e. `c` in `def foo(c: C)` needs
to be unwrapped, whereas `cs: List[C]`, `cs: C*` and even `cs: Array[C]`
do not).
updates the test for by-name value class parameters
unifies method and constructor handling in JavaMirrors

This automatically brings performance fixes and correct handling of
values class / by-name params into the constructor land.
SI-7328 FieldMirrors now support value classes
SI-8092 More verify for f-interpolator

Attempt to verify the nooks and crannies of the format string.

Allows all syntax in the javadoc, including arg indexes. If the
specifier after an arg has an index that doesn't refer to the arg,
a warning is issued and the missing `%s` is prepended (just as
for a part with a leading `%n`).

Other enhancements include detecting that a `Formattable` wasn't
supplied to `%#s`.

Error messages attempt to be pithy but descriptive.
update mailmap
SI-7322 Interpolator idents must be encoded

Otherwise, they are not found.

This matters for term names with a differential encoding.

Footnote, normally ident() encodes, but INTERPOLATIONID
is !isIdent, so that is not used here.  Maybe that would
be the better improvement.
Improve ExecutionContext implicitNotFound and docs

It is not good practice to import a specific ExecutionContext
all over the place; we shouldn't recommend that. People should
allow callers to specify the context in most cases and only
import the context in some central location in their code.

While we are at it, add some more comprehensive docs to
ExecutionContext which will hopefully give people enough understanding
to make decisions about it.
SI-7933 REPL javax.script eval is cached result

The problem is that the repl underneath the script engine evaluates input to
val res0..resN, so it is a one shot operation. To allow repetition,
compile(script) now returns a CompiledScript object whose eval method can be
called any number of times.
Avoid generic collections operations hot paths

 - Use a specialized version of List#{map, collectFirst}
   These special case mapping over an empty list and avoid
   allocating.
 - Avoid nonEmpty in favor of `ne Nil`

I see in the order of 2% speedup.

Perhaps more useful is that
these methods no longer dominate the YourKit profiles, even though
profiler bias due to safepoints at allocation of the ListBuffer
might have been overstating their significance.
Optimize isSelfSuperCall

Avoid the Applied extractor altogether, as that eagerly
creates `argss` which we don't need and which is quite
expensive.