sparc.md (UNSPEC_FRAME_BLOCKAGE): New constant.
* config/sparc/sparc.md (UNSPEC_FRAME_BLOCKAGE): New constant. (frame_blockage): New expander. (frame_blockage<P:mode>): New instruction. * config/sparc/sparc.c (sparc_expand_prologue): When the sequence of instructions establishing the frame isn't atomic, emit frame blockage. From-SVN: r182420
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