[binutils-gdb] Allow subscripting raw pointers

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*** TEST RESULTS FOR COMMIT 42d940118a6372d6e85f71a54fed75fdf5c606bd ***

Author: Manish Goregaokar <manish@mozilla.com>
Branch: master
Commit: 42d940118a6372d6e85f71a54fed75fdf5c606bd

Allow subscripting raw pointers

This will be useful for dealing with vectors; regardless of our final solution
for the Index trait.

2016-07-06  Manish Goregaokar  <manish@mozilla.com>

gdb/ChangeLog:
    * rust-lang.c (rust_subscript): Allow subscripting pointers

gdb/testsuite/ChangeLog:
    * simple.rs: Add test for raw pointer subscripting
    * simple.exp: Add test expectations