[llvm] [CodeGen] Make LoadExtActions address-space aware (PR #162407)

[Matt Arsenault via llvm-commits]

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@@ -1243,10 +1243,32 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
         EVT ExtVT = EVT::getEVT(Dst);
         EVT LoadVT = EVT::getEVT(Src);
         unsigned LType =
-          ((Opcode == Instruction::ZExt) ? ISD::ZEXTLOAD : ISD::SEXTLOAD);
-        if (DstLT.first == SrcLT.first &&
-            TLI->isLoadExtLegal(LType, ExtVT, LoadVT))
-          return 0;
+            ((Opcode == Instruction::ZExt) ? ISD::ZEXTLOAD : ISD::SEXTLOAD);
+
+        if (I) {
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arsenm wrote:

TTI changes probably should be beyond the scope of the initial patch 

https://github.com/llvm/llvm-project/pull/162407