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Return NULL if passed NULL.
* frame.h: Declare it.
* expression.h (union exp_element): Add field block.
* parse.c (write_exp_elt_block): New function.
* expression.h (OP_VAR_VALUE): Now takes additional struct block *.
* *-exp.y: Write block for OP_VAR_VALUE.
* eval.c, expprint.c, parse.c: Deal with block for OP_VAR_VALUE.
* valops.c, value.h (value_of_variable), callers:
Add second argument, for block.
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the saved pc from sigcontext on the stack for BSD signal handling.
* config/i386/tm-i386bsd.h (SIGTRAMP_START, SIGTRAMP_END, FRAME_CHAIN,
FRAMELESS_FUNCTION_INVOCATION, FRAME_SAVED_PC, SIGCONTEXT_PC_OFFSET):
Define to make backtracing through sigtramp work.
* config/vax/tm-vax.h (SIGTRAMP_START, SIGTRAMP_END, TARGET_UPAGES,
FRAME_SAVED_PC, SIGCONTEXT_PC_OFFSET): Ditto.
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