malloc patch for 2.2.4

[Andreas Schwab]

Wolfram Gloger <Wolfram.Gloger@dent.med.uni-muenchen.de> writes:

|> For full portability, you're correct, no question.  Specific
|> platforms, however, can and do make more stringent atomicity
|> guarantees (all of the ones targeted by ptmalloc have atomic access to
|> pointers, for example), and the compiler should not spoil this by such
|> a useless re-load from memory.

This may be useless at first sight, but may be better from a broader point
of view.  If you disallow it you may get less efficient code.

Andreas.

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