[NFC][SYCL] Fix -Wreorder warning about order of initialization (#3660)

Inside LoopAttributes::LoopAttributes(bool IsParallel) in CGLoopInfo.cpp file, 
SYCLIntelFPGAVariantCount is initialized after SYCLSpeculatedIterationsNIterations. 

  /// Value for count variant (min/max/avg) and count metadata.
   llvm::SmallVector<std::pair<const char *, unsigned int>, 2>
       SYCLIntelFPGAVariantCount;

This patch removes the initialization from the ctor init list to avoid a -Wreorder warning since SYCLIntelFPGAVariantCount  is defined as SmallVector which default constructs just fine here.

Author: smanna12

clang/lib/CodeGen/CGLoopInfo.cpp

@@ -627,11 +627,10 @@ LoopAttributes::LoopAttributes(bool IsParallel)
       SYCLLoopCoalesceNLevels(0), SYCLLoopPipeliningDisable(false),
       SYCLMaxInterleavingEnable(false), SYCLMaxInterleavingNInvocations(0),
       SYCLSpeculatedIterationsEnable(false),
-      SYCLSpeculatedIterationsNIterations(0), SYCLIntelFPGAVariantCount(false),
-      UnrollCount(0), UnrollAndJamCount(0),
-      DistributeEnable(LoopAttributes::Unspecified), PipelineDisabled(false),
-      PipelineInitiationInterval(0), SYCLNofusionEnable(false),
-      MustProgress(false) {}
+      SYCLSpeculatedIterationsNIterations(0), UnrollCount(0),
+      UnrollAndJamCount(0), DistributeEnable(LoopAttributes::Unspecified),
+      PipelineDisabled(false), PipelineInitiationInterval(0),
+      SYCLNofusionEnable(false), MustProgress(false) {}
 
 void LoopAttributes::clear() {
   IsParallel = false;