Reviewers: Kasper Lund,

Message:
Part I.

Description:
Introduce a BreakTarget subclass of JumpTarget used to represent the
blocks labeled by "break", "continue", and "return".  BreakTargets are
the only jump targets that appear in the AST, the only ones that can
be uninitialized, and the only ones that can be shadowed.

Please review this at http://codereview.chromium.org/42008

SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/

Affected files:
   M     src/ast.h
   M     src/ast.cc
   M     src/codegen-arm.h
   M     src/codegen-arm.cc
   M     src/codegen-ia32.h
   M     src/codegen-ia32.cc
   M     src/jump-target.h
   M     src/jump-target.cc
   M     src/parser.cc



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