PATCH to lookup_label

[Per Bothner]

I checked the attached patch into mainline.

The function lookup_label generates a LABEL_DECL from a bytecode offset.
It used to do this by mapping a bytecode offset to an identifier
"LJpc=NNN" where NNN is the bytecode offset (pc).  Unfortunately,
different methods may need different labels at the same offset.
This causes confusion - at least when inlining is done.  I fixed
the problem by instead generating (informally) "LJpc=MMMNNN" where
MMM is counter that is incremented for each new method.  This
assumes that all calls to lookup_label for a given method happen
before we call expand_byte_code for the next method.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/
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