[PATCH, committed] error_for_asm and warning_for_asm take const rtx_insn *

[David Malcolm]

The attached patch strengthens various diagnostic-reporting rtx from rtx
to rtx_insn *, and thus falls under the pre-approval granted by Jeff
here:
  https://gcc.gnu.org/ml/gcc-patches/2014-08/msg01310.html

Bootstrapped on x86_64-unknown-linux-gnu (Fedora 20), and has been
rebuilt as part of a config-list.mk build for all working configurations
(albeit with other patches for the latter case).

Committed to trunk as r215133.

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