[BasicTTIImpl] Add cost entries for ldexp, [l]lround

The ldexp intrinsic is incorrectly costed as 1, due to a missing entry
in BasicTTIImpl::getTypeBasedIntrinsicCost: fix this. While
at it, fix missing entries for [l]lround, which is costed as 1 anyway,
making the change non-functional.

Author: artagnon

llvm/include/llvm/CodeGen/BasicTTIImpl.h

@@ -2243,6 +2243,9 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
     case Intrinsic::log2:
       ISD = ISD::FLOG2;
       break;
+    case Intrinsic::ldexp:
+      ISD = ISD::FLDEXP;
+      break;
     case Intrinsic::fabs:
       ISD = ISD::FABS;
       break;
@@ -2297,6 +2300,12 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
     case Intrinsic::roundeven:
       ISD = ISD::FROUNDEVEN;
       break;
+    case Intrinsic::lround:
+      ISD = ISD::LROUND;
+      break;
+    case Intrinsic::llround:
+      ISD = ISD::LLROUND;
+      break;
     case Intrinsic::pow:
       ISD = ISD::FPOW;
       break;