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an error may be signalled.

	BEFORE_POTENTIAL_GC before DISCARD.

(unmark_byte_stack): Renamed from relocate_byte_pcs.  Use
XUNMARK.

locally there.  Rearrange case statements so that thos most
frequently executed come first.  Avoid goto's in frequently
executed cases.

AFTER_POTENTIAL_GC around internal_catch.

(byte_stack_list, mark_byte_stack, relocate_byte_pcs): New
(BEFORE_POTENTIAL_GC, AFTER_POTENTIAL_GC): New.
(FETCH, PUSH, POP, DISCARD, TOP, MAYBE_GC): Rewritten.
(HANDLE_RELOCATION): Removed.
(Fbyte_code): Use byte_stack structures.

(Bsave_current_buffer_1): New byte code.
(Fbyte_code): Delete handling Bread_char.
Handle Bsave_current_buffer_1 like Bsave_current_buffer.

(MAYBE_GC): Call HANDLE_RELOCATION.  Swallow following semicolon.
(Fbyte_code): Use HANDLE_RELOCATION.

(Fbyte_code): Use MAYBE_GC in every goto opcode.

(Fbyte_code): Handle Bsave_current_buffer.

compare as ints.

as functions.  Don't mask char-syntax arg to just 8 bits.

general test.  Simplify.

	temp_output_buffer_show.

	bytestr.

	* bytecode.c (Fbyte_code): When metering the Bcall opcodes, make
	sure the count on the symbol's `byte-code-meter' property does not
	overflow.

	* bytecode.c (syms_of_bytecode): Add a docstring for
	byte-metering-on.

	sure the count on the symbol's `byte-code-meter' property does not
	overflow.

	* bytecode.c (syms_of_bytecode): Add a docstring for
	byte-metering-on.