[OpenJDK 2D-Dev] [11] Upgrade to Marlin renderer 0.9.1

[Laurent Bourgès]

Hi,

Please review this large patch providing Marlin 0.9.1 for JDK 11:

JBS: to be created asap
webrev: http://cr.openjdk.java.net/~lbourges/marlin/marlin-091.0/

Changes:
- *ArrayCache: removed clean flag and usage of jdk.internal.UNSAFE.
allocateUninitializedArray()
- (D)Curve: added support for lines (curve type 4) + new methods x/y Points
to compute intersections on clip edges
- (D)Dasher: use new CurveBasicMonotonizer & CurveClipSplitter to perform
clipping in Dasher that uses skipLen() to compute properly the dash phase &
state
- (D)Helpers: refined precision in cubicRootsInAB (float variant) + add
fastXXXLen() to quickly estimate curve length from control points
      moved findSubdivPoints() from (D)Stroker + added findClipPoints() to
determine t values corresponding to curve intersections with the clip edges
+ added subdivideLineAt() to subdivide line segments
- (D)MarlinRenderingEngine: disable stroker clipping if dasher clipping
enabled (2nd clipping is counter-productive) + initialize new path
simplifier if enabled (disabled by default) + log new settings
- (D)Renderer: refined [quad/cubic]BreakIntoLinesAndAdd loops to enhance
accuracy (smaller error related to 2nd ddx/y) with asymetric supixel counts
- (D)Stroker: use new CurveBasicMonotonizer & CurveClipSplitter (code
refactoring)
- (D)TransformingPathConsumer2D: use CurveClipSplitter in PathClipFilter to
clip filled shapes overlapping clipping edges
            added CurveClipSplitter that subdivides curves (line, quad,
cubic) at clip intersections (+ small padding to avoid precision issues)
            added CurveBasicMonotonizer to monotonize curves (before in
Stroker) to make it on initial curve in Dasher (more efficient than for all
dashes)
- (D)PathSimplifier: new basic path clipper (disabled by default) ignoring
too small segments (radial distance threshold)
- ClipShapeTest: improved test to use a small tolerance as clipped curves
(at clip edges) has minor impact on computed offsets for stroked shapes and
on dash positions: overall quality is improved as previously larger curves
had more accumulated error on either dashes or stroke offsets

Build & jtreg tests: OK

Cheers,
Laurent
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