Add --generate-debug-info flag and remove the other two flags.

Replace the flags --include-debug-symbols and --include-cfi
with single flag called --generate-debug-info (with alias -g).

The name "symbol" was not ideal, since depending on context it
may be interpreted as "ELF symbols", or "debugging information".

This CL also means that we have only the options to include
either all debugging information or none.  This should be fine,
since we can use standard tools to strip anything we do not want.

Change-Id: I721fded56d755d7eed0ef36aa84e841a1f5747f8
diff --git a/compiler/driver/compiler_options.cc b/compiler/driver/compiler_options.cc
index c5fc98a..226e6b7 100644
--- a/compiler/driver/compiler_options.cc
+++ b/compiler/driver/compiler_options.cc
@@ -30,8 +30,7 @@
       include_patch_information_(kDefaultIncludePatchInformation),
       top_k_profile_threshold_(kDefaultTopKProfileThreshold),
       debuggable_(false),
-      include_debug_symbols_(kDefaultIncludeDebugSymbols),
-      include_cfi_(false),
+      generate_debug_info_(kDefaultGenerateDebugInfo),
       implicit_null_checks_(true),
       implicit_so_checks_(true),
       implicit_suspend_checks_(false),
@@ -56,8 +55,7 @@
                                  bool include_patch_information,
                                  double top_k_profile_threshold,
                                  bool debuggable,
-                                 bool include_debug_symbols,
-                                 bool include_cfi,
+                                 bool generate_debug_info,
                                  bool implicit_null_checks,
                                  bool implicit_so_checks,
                                  bool implicit_suspend_checks,
@@ -76,8 +74,7 @@
     include_patch_information_(include_patch_information),
     top_k_profile_threshold_(top_k_profile_threshold),
     debuggable_(debuggable),
-    include_debug_symbols_(include_debug_symbols),
-    include_cfi_(include_cfi),
+    generate_debug_info_(generate_debug_info),
     implicit_null_checks_(implicit_null_checks),
     implicit_so_checks_(implicit_so_checks),
     implicit_suspend_checks_(implicit_suspend_checks),