libgo patch committed: DWARF line reader fixes

[Ian Lance Taylor]

This patch to libgo fixes a couple of things in the DWARF line reader.
It adds support for DW_AT_high_pc as a constant offset from
DW_AT_low_pc.  It adds support for DW_AT_ranges.  Bootstrapped and ran
Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline and 4.7
branch.

This fixes some testsuite failures reported in PR gcc/52583, although
that PR was originally just for Solaris issues.

Ian

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