Make bp_location usage const

[Vladimir Prus]

Vladimir Prus wrote:

> 
> Many parts of breakpoint.c make only read-only use
> of breakpoint location list. However, it's somewhat
> hard to gather from the code. This patch adds 'const'
> qualifiers in a number of places to make this really
> obvious. OK?

I've missed a couple of locations. Sorry, and here's
the updated patch.

- Volodya


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