Woo, it kinda works. We now generate this atrociously bad, but correct,

code for long long foo(long long a, long long b) { return a + b; }

_foo:
        or r2, r3, r3
        or r3, r4, r4
        or r4, r5, r5
        or r5, r6, r6
        rldicr r2, r2, 32, 31
        rldicl r3, r3, 0, 32
        rldicr r4, r4, 32, 31
        rldicl r5, r5, 0, 32
        or r2, r3, r2
        or r3, r5, r4
        add r4, r3, r2
        rldicl r2, r4, 32, 32
        or r4, r4, r4
        or r3, r2, r2
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23809 91177308-0d34-0410-b5e6-96231b3b80d8

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