Add support for displaying soname in an apk.

Changes:
- Change GetSoname to always returns a std::string.
- Added new unit tests for the soname printing.
- Modify the GetElf() function to save the same elf when we see rosegment
  linkers that split the read-only and read-write across a map. This
  avoids creating multiple elf objects for each map.
- Fixed a few offline unwind tests.

Bug: 29218999

Test: Unit tests pass.
Change-Id: Iad7c38b5c2957a8c5fd4ba94ebec335bafcad57d
diff --git a/libunwindstack/tests/ElfInterfaceTest.cpp b/libunwindstack/tests/ElfInterfaceTest.cpp
index 7239749..d895863 100644
--- a/libunwindstack/tests/ElfInterfaceTest.cpp
+++ b/libunwindstack/tests/ElfInterfaceTest.cpp
@@ -555,9 +555,7 @@
   ASSERT_TRUE(elf->Init(&load_bias));
   EXPECT_EQ(0U, load_bias);
 
-  std::string name;
-  ASSERT_TRUE(elf->GetSoname(&name));
-  ASSERT_STREQ("fake_soname.so", name.c_str());
+  ASSERT_EQ("fake_soname.so", elf->GetSoname());
 }
 
 TEST_F(ElfInterfaceTest, elf32_soname) {
@@ -578,8 +576,7 @@
   ASSERT_TRUE(elf->Init(&load_bias));
   EXPECT_EQ(0U, load_bias);
 
-  std::string name;
-  ASSERT_FALSE(elf->GetSoname(&name));
+  ASSERT_EQ("", elf->GetSoname());
 }
 
 TEST_F(ElfInterfaceTest, elf32_soname_after_dt_null) {
@@ -600,8 +597,7 @@
   ASSERT_TRUE(elf->Init(&load_bias));
   EXPECT_EQ(0U, load_bias);
 
-  std::string name;
-  ASSERT_FALSE(elf->GetSoname(&name));
+  ASSERT_EQ("", elf->GetSoname());
 }
 
 TEST_F(ElfInterfaceTest, elf32_soname_size) {
@@ -624,8 +620,7 @@
   ASSERT_TRUE(elf->Init(&load_bias));
   EXPECT_EQ(0U, load_bias);
 
-  std::string name;
-  ASSERT_FALSE(elf->GetSoname(&name));
+  ASSERT_EQ("", elf->GetSoname());
 }
 
 TEST_F(ElfInterfaceTest, elf32_soname_missing_map) {