[X86] Disable loop unrolling in loop vectorization pass when VF is 1.

The patch disabled unrolling in loop vectorization pass when VF==1 on x86 architecture,
by setting MaxInterleaveFactor to 1. Unrolling in loop vectorization pass may introduce
the cost of overflow check, memory boundary check and extra prologue/epilogue code when
regular unroller will unroll the loop another time. Disable it when VF==1 remove the
unnecessary cost on x86. The same can be done for other platforms after verifying
interleaving/memory bound checking to be not perf critical on those platforms.

Differential Revision: http://reviews.llvm.org/D9515


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236613 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUTargetTransformInfo.cpp

@@ -76,7 +76,7 @@ unsigned AMDGPUTTIImpl::getNumberOfRegisters(bool Vec) {
 
 unsigned AMDGPUTTIImpl::getRegisterBitWidth(bool) { return 32; }
 
-unsigned AMDGPUTTIImpl::getMaxInterleaveFactor() {
+unsigned AMDGPUTTIImpl::getMaxInterleaveFactor(unsigned VF) {
   // Semi-arbitrary large amount.
   return 64;
 }