tree 2126153a21557204dd60a05605c4aa0445155b11
parent ebca57adecb3521d78e4e1e5c220df897f84e336
author Christopher Ferris <cferris@google.com> 1512193057 -0800
committer Christopher Ferris <cferris@google.com> 1512508367 -0800

Demand read load bias for a map.

Add a static GetLoadBias method to the Elf object that only reads just
enough to get the load bias.

Add a method to MapInfo that gets the load bias. First attempt to get
it if the elf object already exists. If no elf object was created, use
the new static method to get the load bias.

In BacktraceMap, add a custom iterator so that when code dereferences
a map element, that's when the load bias will be retrieved if it hasn't
already been set.

Bug: 69871050

Test: New unit tests, verify tombstones have non-zero load bias values for
Test: libraries with a non-zero load bias.
Change-Id: I125f4abc827589957fce2f0df24b0f25d037d732