[code-reflection] RFR: Simplify LanewiseBinaryOpExtraction now we have concrete types to check

[Gary Frost]

Following  https://github.com/openjdk/babylon/pull/842

We can greatly simplify LanewiseBinaryOpExperiment 

java @.bld 
java @.exp ffi-opencl LanewiseBinaryOpExtraction

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Commit messages:
 - Simplify LanewiseBinaryOpExtraction now we have concrete types to check

Changes: https://git.openjdk.org/babylon/pull/848/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=848&range=00
  Stats: 224 lines in 2 files changed: 81 ins; 140 del; 3 mod
  Patch: https://git.openjdk.org/babylon/pull/848.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/848/head:pull/848

PR: https://git.openjdk.org/babylon/pull/848