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1) Make non-legal 256-bit loads to be promoted to v4i64. This lets us canonize the loads and handle things the same way we use to handle for 128-bit registers. Despite of what one of the removed comments explained, the load promotion would not mess with VPERM, it's only a matter of doing the appropriate bitcasts when this instructions comes to be introduced. Also make LOAD v8i32 legal. 2) Doing 1) exposed two bugs: - v4i64 was being promoted to itself for several opcodes (introduced in r124447 by David Greene) causing endless recursion and the stack to explode. - there was no support for allOnes BUILD_VECTORs and ANDNP would fail to match because it was generating early target constant pools during lowering. 3) The testcases are already checked-in, doing 1) exposed the bugs in the current testcases. 4) Tidy up code to be more clear and explicit about AVX. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135313 91177308-0d34-0410-b5e6-96231b3b80d8
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