Add DwarfOp support.

Bug: 23762183

Test: New unit tests pass.
Change-Id: I9581701ee2721283a1114adab4e1bcff881980cc
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index dabeac1..17ede51 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -48,6 +48,7 @@
     srcs: [
         "ArmExidx.cpp",
         "DwarfMemory.cpp",
+        "DwarfOp.cpp",
         "Elf.cpp",
         "ElfInterface.cpp",
         "ElfInterfaceArm.cpp",
@@ -89,6 +90,8 @@
         "tests/ArmExidxDecodeTest.cpp",
         "tests/ArmExidxExtractTest.cpp",
         "tests/DwarfMemoryTest.cpp",
+        "tests/DwarfOpLogTest.cpp",
+        "tests/DwarfOpTest.cpp",
         "tests/ElfInterfaceArmTest.cpp",
         "tests/ElfInterfaceTest.cpp",
         "tests/ElfTest.cpp",