src: v12.x-compatible DescriptorArray

[mmarchini]

V8 changed DescriptorArray from a FixedArray to a proper HeapObject. These changes update accessors for DescriptorArray fields to make them compatible with FixedArray-like and HeapObject-like access.

Ref: https://github.com/nodejs/llnode/issues/255

[codecov-io]

Codecov Report

Merging #325 into master will increase coverage by 0.32%. The diff coverage is 56.97%.

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
+ Coverage   78.32%   78.64%   +0.32%     
==========================================
  Files          33       33              
  Lines        4262     4290      +28     
==========================================
+ Hits         3338     3374      +36     
+ Misses        924      916       -8

Impacted Files	Coverage Δ
src/llv8.h	83.33% <ø> (+2.38%)	:arrow_up:
src/llv8-constants.h	100% <ø> (+1.51%)	:arrow_up:
src/llv8-constants.cc	83.06% <100%> (+1.01%)	:arrow_up:
src/llscan.cc	61.25% <100%> (ø)	:arrow_up:
src/printer.cc	76.38% <39.28%> (-1.32%)	:arrow_down:
src/llv8.cc	72.43% <50%> (+1.81%)	:arrow_up:
src/llv8-inl.h	91.76% <71.42%> (-0.11%)	:arrow_down:
src/llnode_module.cc	89.87% <0%> (-0.64%)	:arrow_down:
... and 5 more

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[mmarchini]

cc @nodejs/llnode

[mmarchini]

Ping @nodejs/llnode, we need this for v12 support.

[mmarchini]

Superseded by #330