llvm-dwarfdump: Replace -debug-dump=sect option with individual options.

As discussed on llvm-dev in
http://lists.llvm.org/pipermail/llvm-dev/2017-September/117301.html
this changes the command line interface of llvm-dwarfdump to match the
one used by the dwarfdump utility shipping on macOS. In addition to
being shorter to type this format also has the advantage of allowing
more than one section to be specified at the same time.

In a nutshell, with this change

  $ llvm-dwarfdump --debug-dump=info
  $ llvm-dwarfdump --debug-dump=apple-objc

becomes

  $ dwarfdump --debug-info --apple-objc

Differential Revision: https://reviews.llvm.org/D37714

llvm-svn: 312970
diff --git a/llvm/test/DebugInfo/X86/live-debug-variables.ll b/llvm/test/DebugInfo/X86/live-debug-variables.ll
index 90d5b0b..fbfd1d9 100644
--- a/llvm/test/DebugInfo/X86/live-debug-variables.ll
+++ b/llvm/test/DebugInfo/X86/live-debug-variables.ll
@@ -1,4 +1,4 @@
-; RUN: llc -mtriple=x86_64-linux-gnu -filetype=obj -o - %s | llvm-dwarfdump -debug-dump=loc - | FileCheck %s
+; RUN: llc -mtriple=x86_64-linux-gnu -filetype=obj -o - %s | llvm-dwarfdump -debug-loc - | FileCheck %s
 
 ; The test inlines the function F four times, with each inlined variable for
 ; "i4" sharing the same virtual register. This means the live interval of the