[PATCH] Introduce -fsanitize-trap= flag.

[Peter Collingbourne]

Hi samsonov,

This flag controls whether a given sanitizer traps upon detecting
an error. It currently only supports UBSan. The existing flag
-fsanitize-undefined-trap-on-error has been made an alias of
-fsanitize-trap=undefined.

This change also cleans up some awkward behavior around the combination
of -fsanitize-trap=undefined and -fsanitize=undefined. Previously we
would reject command lines containing the combination of these two flags,
as -fsanitize=vptr is not compatible with trapping. This required the
creation of -fsanitize=undefined-trap, which excluded -fsanitize=vptr
(and -fsanitize=function, but this seems like an oversight).

Now, -fsanitize=undefined is an alias for -fsanitize=undefined-trap,
and if -fsanitize-trap=undefined is specified, we treat -fsanitize=vptr
as an "unsupported" flag, which means that we error out if the flag is
specified explicitly, but implicitly disable it if the flag was implied
by -fsanitize=undefined.

http://reviews.llvm.org/D10464

Files:
  docs/UsersManual.rst
  include/clang/Basic/Sanitizers.def
  include/clang/Driver/Options.td
  include/clang/Driver/SanitizerArgs.h
  include/clang/Frontend/CodeGenOptions.def
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/CGExpr.cpp
  lib/Driver/SanitizerArgs.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/bounds-checking.c
  test/CodeGen/catch-undef-behavior.c
  test/CodeGen/sanitize-trap.c
  test/Driver/fsanitize.c

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