[RFA] Fix verification of changed values for big values.

[Thiago Jung Bauermann]

Hi,

This is a resubmission of a patch I posted long ago:

http://sourceware.org/ml/gdb-patches/2009-05/msg00670.html

It's good on its own, but is also important for ranged watchpoints in our
ppc476 support patches. Here's my original explanation:

	Right now, GDB calls value_equal when comparing the old and new values
	of a watchpoint. IMO this is not correct, since that function will call
	coerce_array and effectively just compare the addresses of arrays being
	watched.

	This patch introduces a new value comparison function which works in the
	mentioned case, and a testcase which fails without the patch and passes
	with it.

Tromey had approved it here:

http://sourceware.org/ml/gdb-patches/2009-06/msg00076.html

But I don't know if approvals expire or not, so...

This version addresses Tromey's comments.
-- 
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center

gdb/
	* valarith.c (value_equal_contents): New function.
	* value.h (value_equal_contents): Declare.
	* breakpoint.c (watchpoint_check): Use value_equal_contents
	instead of value_equal.

gdb/testsuite/
	* gdb.base/watchpoint.exp (test_watchpoint_in_big_blob): New function.
	(top level): Call test_watchpoint_in_big_blob.
	* gdb.base/watchpoint.c (buf): Change size to value too big for hardware
	watchpoints.
	(func3): Write to buf.
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