[PATCH][cilkplus] fix c++ implicit conversions with cilk_spawn (PR/69024, PR/68997)

[Ryan Burn <rnickb731 at gmail dot com>]

This patch follows on from
https://gcc.gnu.org/ml/gcc-patches/2015-12/msg02142.html

As discussed, it creates a separate function
cilk_cp_detect_spawn_and_unwrap in gcc/cp to handle processing
cilk_spawn expressions for c++ and adds support for implicit
constructor and type conversions.

Bootstrapped and regression tested on x86_64-linux.

gcc/c-family/ChangeLog:
2015-01-20  Ryan Burn  <contact@rnburn.com>

  PR c++/69024
  PR c++/68997
  * cilk.c (cilk_ignorable_spawn_rhs_op): Change to have external linkage.
  * cilk.c (recognize_spawn): Rename to cilk_recognize_spawn. Change to have
  external linkage.
  * cilk.c (cilk_detect_and_unwrap): Rename to recognize_spawn to
  cilk_recognize_spawn.
  * cilk.c (extract_free_variables): Don't extract free variables from
  AGGR_INIT_EXPR slot.

gcc/cp/ChangeLog
2015-01-20  Ryan Burn  <contact@rnburn.com>

  PR c++/69024
  PR c++/68997
  * cp-gimplify.c (cp_gimplify_expr): Call cilk_cp_detect_spawn_and_unwrap
  instead of cilk_detect_spawn_and_unwrap.
  * cp-cilkplus.c (is_conversion_operator_function_decl_p): New.
  * cp-cilkplus.c (find_spawn): New.
  * cp-cilkplus.c (cilk_cp_detect_spawn_and_unwrap): New.

gcc/testsuite/ChangeLog
2015-01-20  Ryan Burn  <contact@rnburn.com>

  PR c++/69024
  PR c++/68997
  * g++.dg/cilk-plus/CK/pr68001.cc: Fix to not depend on broken diagnostic.
  * g++.dg/cilk-plus/CK/pr69024.cc: New test.
  * g++.dg/cilk-plus/CK/pr68997.cc: New test.

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