check that terminators only occur at the end of a block.  This catches the common problem of putting two terminators in the same block.  I can't write a testcase for this because the .ll parser rejects this before the verifier can, but this can occur when generating IR.
check that terminators only occur at the end of a block.  This catches the
common problem of putting two terminators in the same block.  I can't write
a testcase for this because the .ll parser rejects this before the verifier
can, but this can occur when generating IR.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@46900 91177308-0d34-0410-b5e6-96231b3b80d8

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