Fix DecisionForestBenchmark.cpp compile errors

clang-tools-extra/clangd/benchmarks/CompletionModel/DecisionForestBenchmark.cpp fails to compile since `"CompletionModel.h"` is auto-generated from clang-tools-extra/clangd/quality/model/features.json, which was changed in https://reviews.llvm.org/D94697 to remove `setFilterLength` and `setIsForbidden`, rename `setFileProximityDistance` and `setSymbolScopeDistance`, and add `setNumNameInContext` and `setFractionNameInContext`.  This patch removes calls to the two removed functions, updates calls to the two renamed functions, and adds calls to the two new functions. (`20` is an arbitrary choice for the `setNumNameInContext` argument.) It also changes the `FlipCoin` argument from float to double to silence lossy conversion warnings.

Note: I don't use this tool but encountered the build errors and took a shot at fixing them. Please holler if there's another recommended solution. Thanks!

Reviewed By: usaxena95

Differential Revision: https://reviews.llvm.org/D97620

Author: usx95

Diff for: clang-tools-extra/clangd/benchmarks/CompletionModel/DecisionForestBenchmark.cpp

@@ -21,7 +21,7 @@ namespace clang {
 namespace clangd {
 namespace {
 std::vector<Example> generateRandomDataset(int NumExamples) {
-  auto FlipCoin = [&](float Probability) {
+  auto FlipCoin = [&](double Probability) {
     return rand() % 1000 <= Probability * 1000;
   };
   auto RandInt = [&](int Max) { return rand() % Max; };
@@ -38,15 +38,15 @@ std::vector<Example> generateRandomDataset(int NumExamples) {
     E.setIsImplementationDetail(FlipCoin(0.3)); // Boolean.
     E.setNumReferences(RandInt(10000));         // Can be large integer.
     E.setSymbolCategory(RandInt(10));           // 10 Symbol Category.
-
+    E.setNumNameInContext(RandInt(20));         // 0 to ContextWords->size().
+    E.setFractionNameInContext(RandFloat(1.0)); // Float in range [0,1].
     E.setIsNameInContext(FlipCoin(0.5)); // Boolean.
-    E.setIsForbidden(FlipCoin(0.1));     // Boolean.
     E.setIsInBaseClass(FlipCoin(0.3));   // Boolean.
-    E.setFileProximityDistance(
+    E.setFileProximityDistanceCost(
         FlipCoin(0.1) ? 999999 // Sometimes file distance is not available.
                       : RandInt(20));
     E.setSemaFileProximityScore(RandFloat(1)); // Float in range [0,1].
-    E.setSymbolScopeDistance(
+    E.setSymbolScopeDistanceCost(
         FlipCoin(0.1) ? 999999 // Sometimes scope distance is not available.
                       : RandInt(20));
     E.setSemaSaysInScope(FlipCoin(0.5));      // Boolean.
@@ -56,7 +56,6 @@ std::vector<Example> generateRandomDataset(int NumExamples) {
     E.setHadContextType(FlipCoin(0.6));       // Boolean.
     E.setHadSymbolType(FlipCoin(0.6));        // Boolean.
     E.setTypeMatchesPreferred(FlipCoin(0.5)); // Boolean.
-    E.setFilterLength(RandInt(15));
     Examples.push_back(E);
   }
   return Examples;