More replacing of  target-dependent intrinsics with target-indepdent  intrinsics.  The second instruction(s) to be handled are the vector versions  of count set bits (ctpop).
More replacing of  target-dependent intrinsics with target-indepdent 
intrinsics.  The second instruction(s) to be handled are the vector versions 
of count set bits (ctpop).

The changes here are to clang so that it generates a target independent 
vector ctpop when it sees an ARM dependent vector bits set count.  The changes 
in llvm are to match the target independent vector ctpop and in 
VMCore/AutoUpgrade.cpp to update any existing bc files containing ARM 
dependent vector pop counts with target-independent ctpops.  There are also 
changes to an existing test case in llvm for ARM vector count instructions and 
to a test for the bitcode upgrade.

<rdar://problem/11892519>

There is deliberately no test for the change to clang, as so far as I know, no
consensus has been reached regarding how to test neon instructions in clang;
q.v. <rdar://problem/8762292>


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@160409 91177308-0d34-0410-b5e6-96231b3b80d8

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