Add --include-cfi compiler option.

Decouple generation of CFI from the rest of debug symbols.
This makes it possible to generate oat with CFI but without
the rest of debug symbols.

This is in line with intention of the .eh_frame section.
The section does not have the .debug_ prefix because it
is considered somewhat different to the rest of debug symbols.

Change-Id: I32816ecd4f30ac4e0dc69d69a4993e349c737f96
diff --git a/compiler/oat_writer.cc b/compiler/oat_writer.cc
index 4de287e..73d7210 100644
--- a/compiler/oat_writer.cc
+++ b/compiler/oat_writer.cc
@@ -450,7 +450,8 @@
         }
       }
 
-      if (writer_->compiler_driver_->GetCompilerOptions().GetIncludeDebugSymbols()) {
+      if (writer_->compiler_driver_->GetCompilerOptions().GetIncludeDebugSymbols() ||
+          writer_->compiler_driver_->GetCompilerOptions().GetIncludeCFI()) {
         // Record debug information for this function if we are doing that.
         const uint32_t quick_code_start = quick_code_offset -
             writer_->oat_header_->GetExecutableOffset() - thumb_offset;