[lldb] Enable debugging of binaries with mixed (splitted/regular) dwarf

Initialize the default value of SymbolFileDWARF uuid with 
the appropriately shifted DW_INVALID_OFFSET constant.
This change fixes the collision in the computation of DIE uid 
(inside DIERef::GetUID) and incorrect CompileUnit lookup
(because of the misleading cu_offset value).

Test plan: make check-lldb

Differential revision: https://reviews.llvm.org/D42563

llvm-svn: 323832

1 files changed, 11 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/linux/mix-dwo-and-regular-objects/b.c b/lldb/packages/Python/lldbsuite/test/linux/mix-dwo-and-regular-objects/b.c
new file mode 100644
index 00000000000..d79970e13d4
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/linux/mix-dwo-and-regular-objects/b.c
@@ -0,0 +1,11 @@
+extern int f();
+
+void g() {
+  int y = 14;
+  int x = f();
+}
+
+int main() {
+  g();
+  return 0;
+}