This patch replaces signed integer types with signless ones:
1. [US]Byte -> Int8
2. [U]Short -> Int16
3. [U]Int   -> Int32
4. [U]Long  -> Int64.
5. Removal of isSigned, isUnsigned, getSignedVersion, getUnsignedVersion
   and other methods related to signedness. In a few places this warranted
   identifying the signedness information from other sources.

llvm-svn: 32785

This patch implements the first increment for the Signless Types feature.
All changes pertain to removing the ConstantSInt and ConstantUInt classes
in favor of just using ConstantInt.

llvm-svn: 31063

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is actually dead because of this!

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types and can have arbitrary 32- and 64-bit integer types indexing into
sequential types.

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add flags for PR82

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Header files will be on the way.

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PassMAnager provides.

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    indexes for sequential types.

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of instruction constructors.

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For details, See: docs/2002-06-25-MegaPatchInfo.txt

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llvm-svn: 2378

* Allow structs with negative offsets.  This enables the em3d benchmark to
  be made typesafe.  In this case, the struct had an array as the first
  element, so a negative index was ok (the expr was -8 + 8x)

llvm-svn: 2271

test/Regression/Transforms/LevelRaise/2002-04-09-MissedRaise.ll

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in iOther.h

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class.  The Method class is obsolete (renamed) and all references to it
are being converted over to Function.

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first element of a structure type.  Before this would not be handled because
getStructOffset would either stop immediately (because StopEarly was true
and Offset = 0), or blast past the level we wanted.

Now ConvertableToGEP steps down through the type one level at a time, checking
the Offset and Scale conditions at each step

llvm-svn: 1931

llvm-svn: 1930

2. Allow negative scales in ConvertableToGEP, so that this loop from
   alloc_tree in the Olden health benchmark is correctly raised:

       for (i = 3; i >= 0; i--)
         fval[i] = alloc_tree(level - 1, label*4 + i + 1, new);

   Stepping through the array backwards caused a negative scale.

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