Add function definitions for MapInfo.

Bug: 23762183

Test: All new unit tests pass.
Change-Id: I26a1f6e84bf1a02447eff48ff6e35068554330fe
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index e35593f..05d0353 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -54,6 +54,7 @@
         "ElfInterfaceArm.cpp",
         "Log.cpp",
         "Regs.cpp",
+        "MapInfo.cpp",
         "Maps.cpp",
         "Memory.cpp",
         "Symbols.cpp",
@@ -98,6 +99,7 @@
         "tests/ElfInterfaceTest.cpp",
         "tests/ElfTest.cpp",
         "tests/LogFake.cpp",
+        "tests/MapInfoTest.cpp",
         "tests/MapsTest.cpp",
         "tests/MemoryFake.cpp",
         "tests/MemoryFileTest.cpp",