[PATCH] Implement command line options for stack probe space

[Andrew H]

Added some management code to make the special case -mstack-probe-size=0 work. Current behavior is that when -mstack-probe-size is omitted, the X86 target will choose the default stack probe size (which is currently 4096 bytes, but I did not want to expose such internal technicalities to the driver). When -mstack-probe-size=n is used, the X86 target will use a stack probing size of n bytes. Note that in contrast to the stack alignment parameter, n=0 is a valid value for the stack probing size.

Added the test cases to cl-options.c.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6685

Files:
  include/clang/Driver/CLCompatOptions.td
  include/clang/Driver/Options.td
  include/clang/Frontend/CodeGenOptions.def
  lib/CodeGen/BackendUtil.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Driver/cl-options.c

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