* arm-tdep.c (skip_prologue_function): New function.

	* arm-tdep.c (skip_prologue_function): New function.
	(submask, bit, bits, sbits, BranchDest): Move higher in the file.
	(thumb_analyze_prologue): Document return value.  Recognize more
	Thumb instructions, skippable calls, and some Thumb-2 instructions.
	Add debug output.
	(arm_skip_prologue): Remove call dummy check.  Check the prologue
	for non-GNU compilers.
	(arm_instruction_changes_pc): New function.
	(arm_analyze_prologue): New function, broken out from
	arm_scan_prologue.  Recognize more ARM instructions and skippable
	calls.  Update comments.  Handle NULL cache.  Return the address
	of the first unrecognized instruction.  Do not skip past other
	instructions which change control flow.  Add debug output.
	(arm_scan_prologue): Use arm_analyze_prologue.
	(ARM_PC_32): Delete.
	(shifted_reg_val): Simplify ARM_PC_32 check.