[gccgo] Change string data type

[Ian Lance Taylor]

This patch changes the string data type to just be a pointer and a
length, rather than a length and bytes allocated in a single memory
block.  This permits sharing of string constants and makes string
slicing much more efficient.  It also matches the data structure used
by the other Go compiler, which is convenient for SWIG.  Committed to
gccgo branch.

Ian

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