libgccjit: Generate debug info for variables

libgccjit: Generate debug info for variables

Finalize declares via available helpers after location is set. Set
TYPE_NAME of primitives and friends to "int" etc. Debug info is now
set properly for variables.

Signed-off-by:
2021-09-09	Petter Tomner	<tomner@kth.se>

gcc/jit/
	* jit-playback.c: Moved global var processing to after loc handling.
	  Setting TYPE_NAME for fundamental types.
	  Using common functions for finalizing globals.
	* jit-playback.h: New method init_types().
	  Changed get_tree_node_for_type() to method.

gcc/testsuite/
	* jit.dg/test-error-array-bounds.c: Array is not unsigned
	* jit.dg/jit.exp: Helper function
	* jit.dg/test-debuginfo.c: New testcase