[PATCH] [FaultMaps] Let the frontend pre-select implicit null check candidates.

[Sanjoy Das]

Hi atrick, reames, pgavlin, JosephTremoulet,

This change introduces a !make.implicit metadata that allows the
frontend to pre-select the set of explicit null checks that will be
considered for transformation into implicit null checks.

The reason for not using profiling data instead of !make.implicit is
explained in the change to `FaultMaps.rst`.

http://reviews.llvm.org/D10824

Files:
  docs/FaultMaps.rst
  lib/CodeGen/ImplicitNullChecks.cpp
  test/CodeGen/X86/implicit-null-check-negative.ll
  test/CodeGen/X86/implicit-null-check.ll

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