[lldb] Make SBSection::GetSectionData call Section::GetSectionData.

`SBSection::GetSectionData` and `Section::GetSectionData` are
implemented differently, and the `SBSection` method doesn't handle
compressed sections correctly.

Differential Revision: https://reviews.llvm.org/D142672

lldb/test/API/python_api/section/TestSectionAPI.py

@@ -48,3 +48,18 @@ class SectionAPITestCase(TestBase):
         section = target.modules[0].sections[0]
         self.assertEqual(section.GetAlignment(), 0x1000)
         self.assertEqual(section.alignment, 0x1000)
+
+    def test_compressed_section_data(self):
+        exe = self.getBuildArtifact("compressed-sections.out")
+        self.yaml2obj("compressed-sections.yaml", exe)
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target, VALID_TARGET)
+
+        # exe contains a single section with SHF_COMPRESSED. Check that
+        # GetSectionData returns the uncompressed data and not the raw contents
+        # of the section.
+        section = target.modules[0].sections[0]
+        section_data = section.GetSectionData().uint8s
+        self.assertEqual(section_data,
+                         [0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80, 0x90])
+

lldb/test/API/python_api/section/compressed-sections.yaml

@@ -0,0 +1,11 @@
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS32
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_386
+Sections:
+  - Name:            .compressed
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_COMPRESSED ]
+    Content:         010000000800000001000000789c5330700848286898000009c802c1