[RFA 0/9] Explicit locations v2 - Introduction

[Keith Seitz <keiths@redhat.com>]

Hi,

I would like to resurrect this project from last year.

This patch series introduces "explicit" locations, which allow users to 
explicitly specify location attributes when setting breakpoints. This 
feature can be especially handy, for example, when an application 
defines multiple functions of the same name:

(gdb) break -source file1.c -function multiple_symbols_with_this_name

In this case, gdb will only attempt to set a breakpoint in the given 
source file. If the given symbol is not defined in the file, gdb will do 
the usual pending breakpoint query.

This revision is largely the same as the one I posted last year with one 
notable change: I have implemented probe locations.

Consequently, this API change now supports the following "event 
locations": linespec, address (formerly "*EXPR"), explicit, and probe.

I have attempted to break up the patch to assist review. The intent is 
to apply all patches approved. Nonetheless, each patch may be applied 
sequentially and should not cause any build failures or introduce any 
test suite regressions.

I have tested each patch on both x86_64 native and native-gdbserver.

Keith