tests: add run-make-fulldeps split-dwarf test

This commit adds a run-make-fulldeps test which checks that a DWARF
package file is emitted.

Signed-off-by: David Wood <[email protected]>

Author: davidtwco

src/test/run-make-fulldeps/split-dwarf/Makefile

@@ -0,0 +1,8 @@
+-include ../tools.mk
+
+# only-linux
+
+all:
+	$(RUSTC) -Z split-dwarf=split foo.rs
+	rm $(TMPDIR)/foo.dwp
+	rm $(TMPDIR)/$(call BIN,foo)

src/test/run-make-fulldeps/split-dwarf/foo.rs

@@ -0,0 +1 @@
+fn main() {}