ClangCodeModel: Limit result count in clangd-based locator searches

clangd memory usage explodes when the workspace/symbol result count hits
the six-digit mark, so prevent that.

Change-Id: Iefc2eeb3da7fe541e2b1d3105818126980fc3323
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangcodemodel/clanggloballocatorfilters.cpp

@@ -43,6 +43,8 @@
 namespace ClangCodeModel {
 namespace Internal {
 
+const int MaxResultCount = 10000;
+
 class CppLocatorFilter : public CppTools::CppLocatorFilter
 {
 public:
@@ -67,6 +69,7 @@ public:
         setDefaultShortcutString({});
         setEnabled(false);
         setHidden(true);
+        setMaxResultCount(MaxResultCount);
     }
 };
 
@@ -94,6 +97,7 @@ public:
         setDefaultShortcutString({});
         setEnabled(false);
         setHidden(true);
+        setMaxResultCount(MaxResultCount);
     }
 };
 
@@ -121,6 +125,7 @@ public:
         setDefaultShortcutString({});
         setEnabled(false);
         setHidden(true);
+        setMaxResultCount(MaxResultCount);
     }
 };