Add a pyston-specific gdb init file

And source it after loading the pyston executable.

Makefile

@@ -420,7 +420,7 @@ run_unittests:: run_$1_unittests
 )
 endef
 
-GDB_CMDS := $(GDB_PRE_CMDS) --ex "set confirm off" --ex "handle SIGUSR2 pass nostop noprint" --ex run --ex "bt 20" $(GDB_POST_CMDS)
+GDB_CMDS := $(GDB_PRE_CMDS) --ex "source pyston_gdbinit.txt" --ex "run" --ex "bt 20" $(GDB_POST_CMDS)
 BR ?=
 ARGS ?=
 ifneq ($(BR),)

pyston_gdbinit.txt

+handle SIGUSR2 pass nostop noprint
+
+skip file /usr/include/c++/4.8/bits/stl_vector.h
+skip file /usr/include/c++/4.9/bits/stl_vector.h
+
+skip pyston::ArgPassSpec::ArgPassSpec(int, int, bool, bool)
+skip pyston::InternedString::getBox() const
+skip pyston::BoxedString::s() const