WineDbg: Implemented harware assisted breakpoints.

[Eric Pouech]

one can now set a hardware breakpoint in winedbg (it will not insert an 
INT 3 command in the code, but rather use the x86 debug registers).
handy for debugging trashed code for example

all the syntaxic forms of the 'break' command can be used for this new 
hbreak command.
(only works on x86 for now)

ChangeLog:
Implemented harware assisted breakpoints

  programs/winedbg/break.c    |   65 
++++++++++++++++++++++++++++---------------
  programs/winedbg/dbg.y      |   18 ++++++++----
  programs/winedbg/debug.l    |    1 +
  programs/winedbg/debugger.h |    9 +++---
  programs/winedbg/winedbg.c  |    2 +
  5 files changed, 62 insertions(+), 33 deletions(-)

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