RFR: 8255216: Change _directive->BreakAtCompileOption to env()->break_at_compile() [v6]

[Dan]

> _break_at_compile was no longer in use after changes to compile.cpp.
> Change compile.cpp and c1_Compilation.cpp to use env()->break_at_compile() instead
> to make that code no longer dead.
> No new code, and Tier1 tests succeed after code is removed.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8255216

Dan has updated the pull request incrementally with one additional commit since the last revision:

  Remove additional _directive->BreakAtCompileOption calls
  
  Repurpose to env()->break_at_compile()

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1806/files
  - new: https://git.openjdk.java.net/jdk/pull/1806/files/41d01c05..12eedef8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1806&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1806&range=04-05

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1806.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1806/head:pull/1806

PR: https://git.openjdk.java.net/jdk/pull/1806