Removed SELECT_CC custom lowering. This is not needed anymore, the SELECT node

is lowered properly and covers everything LowerSELECT_CC did.
Added method printUnsignedImm in AsmPrinter to print uimm16 operands. This
avoid the ugly instruction by instruction checking in printOperand.
Added a swap instruction present in the allegrex core.
Added two conditional instructions present in the allegrex core : MOVZ and MOVN.
They both allow a more efficient SELECT operation for integers.
Also added SELECT patterns to optimize MOVZ and MOVN usage.
The brcond and setcc patterns were cleaned: redundant and suboptimal patterns
were
removed. The suboptimals were replaced by more efficient ones.
Fixed some instructions that were using immZExt16 instead of immSExt16.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54724 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsSubtarget.cpp

@@ -58,6 +58,8 @@ MipsSubtarget::MipsSubtarget(const TargetMachine &TM, const Module &M,
     HasVFPU = true; // Enables Allegrex Vector FPU (not supported yet)
     HasSEInReg = true;
     HasBitCount = true;
+    HasSwap = true;
+    HasCondMov = true;
   }
 
   // Abicall is the default for O32 ABI and is ignored