Support @ (alignment) operator in PostfixEvaluator

Visual C++ 2010 produces debug symbols with program strings that include a new
operator: @, which is for alignment. This patch adds support for the @ operator.

[Ted Mielczarek]

I always forget that "send mail" is not the default.

[Mark Mentovai]

http://breakpad.appspot.com/349002/diff/1/src/processor/postfix_evaluator-inl.h
File src/processor/postfix_evaluator-inl.h (right):

http://breakpad.appspot.com/349002/diff/1/src/processor/postfix_evaluator-inl...
src/processor/postfix_evaluator-inl.h:133: result = operand1 & (((ValueType)-1)
^ (operand2 - 1));
Use a C++<style>(cast).

http://breakpad.appspot.com/349002/diff/1/src/processor/postfix_evaluator.h
File src/processor/postfix_evaluator.h (right):

http://breakpad.appspot.com/349002/diff/1/src/processor/postfix_evaluator.h#n...
src/processor/postfix_evaluator.h:47: // % (modulus of division), and @
(alignment).  The unary ^ (dereference)
I don’t know what an “alignment” operation does offhand. Can you specify what
the arguments are and in which order they appear?

[Ted Mielczarek]

I updated the patch, but forgot to --send-mail, as usual.

[Mark Mentovai]

LGTM

[Mark Mentovai]

And congratulations.