Backport BigDecimal performance patches

[Andrew Haley]

This is a backport of the BigDecimal performance rewrite.
http://cr.openjdk.java.net/~aph/6622432-openjdk6-webrev/

rev 397 : 6622432: RFE: Performance improvements to java.math.BigDecimal
Reviewed-by: darcy
rev 398 : 6850606: Regression from JDK 1.6.0_12
Summary: The returned result from multiply should be constructed by using valueOf to take care of the INFLATED case.
Reviewed-by: darcy
rev 399 : 6876282: BigDecimal's divide(BigDecimal bd, RoundingFormat r) produces incorrect result
Reviewed-by: darcy

The patches didn't quite apply cleanly, but once I fixed them up by hand
there were no regressions of either the JCK or JTreg.

Given that 2000 lines of patch is rather hard to read, I have attached
a diff between the patched jdk6 and the current jdk7 tree.

OK for jdk6?

Thanks,
Andrew.
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