Emit basic debug information when compiling with the flag
    -fgo-debug-escape#.
    
    Reviewed-on: https://go-review.googlesource.com/22376

	2016-08-02  Chris Manghane  <cmang@google.com>

	* lang.opt: Add -fgo-debug-escape option.
	* go-c.h (go_create_gogo): Add debug_escape_level parameter.
	* go-lang.c (go_langhook_init): Pass go_debug_escape_level to
	go_create_gogo.

From-SVN: r239002