Change OUT from -2 to CHAR_MIN-1, making it impossible for it to inadvertently match a negative char in the RE being compiled.
Change OUT from -2 to CHAR_MIN-1, making it impossible for it to
inadvertently match a negative char in the RE being compiled.

This fixes compilation of "\376" (as an ERE) and "\376\376" (as a BRE).

PR:		84740
MFC after:	1 week

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