proc,dwarf/line: support is_stmt and prologue_end flags

Go1.11 uses the is_stmt flag of .debug_line to communicate which
assembly instructions are good places for breakpoints, we should
respect this flag.

These changes were introduced by:
* https://go-review.googlesource.com/c/go/+/102435/

Additionally when setting next breakpoints ignore all PC addresses that
belong to the same line as the one currently under at the cursor. This
matches the behavior of gdb and avoids stopping multiple times at the
heading line of a for statement with go1.11.

Change: https://go-review.googlesource.com/c/go/+/110416 adds the
prologue_end flag to the .debug_line section to communicate the end of
the stack-split prologue. We should use it instead of pattern matching
the disassembly when available.

Fixes #550

type of interfaces
'c7cde8b'.

Documentation/usage/dlv.md

@@ -36,6 +36,7 @@ Pass flags to the program you are debugging using `--`, for example:
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_attach.md

@@ -36,6 +36,7 @@ dlv attach pid [executable]
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_connect.md

@@ -31,6 +31,7 @@ dlv connect addr
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_core.md

@@ -35,6 +35,7 @@ dlv core <executable> <core>
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_debug.md

@@ -42,6 +42,7 @@ dlv debug [package]
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_exec.md

@@ -36,6 +36,7 @@ dlv exec <path/to/binary>
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_replay.md

@@ -35,6 +35,7 @@ dlv replay [trace directory]
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_run.md

@@ -31,6 +31,7 @@ dlv run
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_test.md

@@ -42,6 +42,7 @@ dlv test [package]
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_trace.md

@@ -44,6 +44,7 @@ dlv trace [package] regexp
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```

Documentation/usage/dlv_version.md

@@ -31,6 +31,7 @@ dlv version
 	debugger	Log debugger commands
 	gdbwire		Log connection to gdbserial backend
 	lldbout		Copy output from debugserver/lldb to standard output
+	debuglineerr	Log recoverable errors reading .debug_line
 Defaults to "debugger" when logging is enabled with --log.
       --wd string            Working directory for running the program. (default ".")
 ```