Bug #:

Submitted by:
Reviewed by:
Fixed typechecking bugs wrt UsualUnaryConversions. Includes two distinct fixes:

#1: Call UsualUnaryConversions in CheckRelationalOperands/CheckEqualityOperands.
#2: UsualArithmeticConversions arguments are now output parameters. This insures
the implicit conversion is seen by clients (and fixes bugs in CheckAdditionOperands
and CheckSubtractionOperands when doing pointer arithmetic).
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llvm-svn: 39649