Reviewers: Michael Starzinger,

Description:
[turbofan] Simply context specialization and fix for OSR.

AstGraphBuilder puts a constant context in from the beginning.
Also fix bug in merging contexts in environment.

[email protected]
BUG=

Please review this at https://codereview.chromium.org/934293002/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+288, -102 lines):
  M src/compiler/ast-graph-builder.h
  M src/compiler/ast-graph-builder.cc
  M src/compiler/control-reducer.cc
  M src/compiler/js-context-specialization.h
  M src/compiler/js-context-specialization.cc
  M src/compiler/js-inlining.cc
  M src/compiler/osr.cc
  M src/compiler/pipeline.cc
  M src/compiler/verifier.cc
  M test/cctest/compiler/test-js-context-specialization.cc
  M test/mjsunit/compiler/osr-block-scope.js
  M test/mjsunit/compiler/osr-block-scope-func.js
  A test/mjsunit/compiler/osr-for-let.js
  M test/mjsunit/compiler/osr-maze1.js
  A test/mjsunit/compiler/osr-while-let.js


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