CARGO_INCREMENTAL breaks debuginfo #3905
Description
In the same project, if I compile with CARGO_INCREMENTAL=1 and run the application through lldb, I get:
$ lldb target/debug/hello
(lldb) target create "target/debug/hello"
Current executable set to 'target/debug/hello' (x86_64).
(lldb) b main
Breakpoint 1: where = hello`main, address = 0x00000001000141d0
Same project without:
$ lldb target/debug/hello
(lldb) target create "target/debug/hello"
Current executable set to 'target/debug/hello' (x86_64).
(lldb) b main
Breakpoint 1: 2 locations.
The latter, I believe, is what we want as it's what you'd get by hand when using rustc. With incremental turned on, we can't easily step into the original source. Instead, we end up stepping through the assembly.