Revert "Debug info: Make DWARF4 the default for Darwin, too."

I'm holding this change to give maintainers of Darwin buildbots more time
to update their toolchains.

This reverts commit r201375.

llvm-svn: 201520
diff --git a/clang/test/Driver/debug-options.c b/clang/test/Driver/debug-options.c
index d18c268..2ea4990 100644
--- a/clang/test/Driver/debug-options.c
+++ b/clang/test/Driver/debug-options.c
@@ -36,11 +36,11 @@
 // RUN: %clang -### -c -gline-tables-only %s 2>&1 \
 // RUN:             | FileCheck -check-prefix=GLTO_ONLY %s
 // RUN: %clang -### -c -gline-tables-only %s -target x86_64-apple-darwin 2>&1 \
-// RUN:             | FileCheck -check-prefix=GLTO_ONLY %s
+// RUN:             | FileCheck -check-prefix=GLTO_ONLY_DARWIN %s
 // RUN: %clang -### -c -gline-tables-only -g %s -target x86_64-linux-gnu 2>&1 \
 // RUN:             | FileCheck -check-prefix=G_ONLY %s
 // RUN: %clang -### -c -gline-tables-only -g %s -target x86_64-apple-darwin 2>&1 \
-// RUN:             | FileCheck -check-prefix=G_ONLY %s
+// RUN:             | FileCheck -check-prefix=G_ONLY_DARWIN %s
 // RUN: %clang -### -c -gline-tables-only -g0 %s 2>&1 \
 // RUN:             | FileCheck -check-prefix=GLTO_NO %s
 //
@@ -76,11 +76,22 @@
 // GLTO_ONLY: "-gline-tables-only"
 // GLTO_ONLY-NOT: "-g"
 //
+// GLTO_ONLY_DARWIN: "-cc1"
+// GLTO_ONLY_DARWIN-NOT: "-g"
+// GLTO_ONLY_DARWIN: "-gline-tables-only"
+// GLTO_ONLY_DARWIN: "-gdwarf-2"
+// GLTO_ONLY_DARWIN-NOT: "-g"
+//
 // G_ONLY: "-cc1"
 // G_ONLY-NOT: "-gline-tables-only"
 // G_ONLY: "-g"
 // G_ONLY-NOT: "-gline-tables-only"
 //
+// G_ONLY_DARWIN: "-cc1"
+// G_ONLY_DARWIN-NOT: "-gline-tables-only"
+// G_ONLY_DARWIN: "-gdwarf-2"
+// G_ONLY_DARWIN-NOT: "-gline-tables-only"
+//
 // GLTO_NO: "-cc1"
 // GLTO_NO-NOT: "-gline-tables-only"
 //