Move RcuVector and relevant support classes to vespalib

Having RCU support available across all our C++ modules open up
new opportunities for optimizations.

This changes the following:
- `RcuVector` moved from `searchlib` to `vespalib`
- `MemoryUsage` moved from `searchlib` to `vespalib`
- Introduce a simplified, more generic `GrowStrategy` in `vespalib`
  used by the moved `RcuVector` which does not have any notion of
  documents. Existing searchlib `GrowStrategy` gets a simple function
  to convert to this generic strategy.

1 files changed, 2 insertions, 2 deletions

diff --git a/searchlib/src/tests/util/searchable_stats/searchable_stats_test.cpp b/searchlib/src/tests/util/searchable_stats/searchable_stats_test.cpp
index f0dd6be6197..c91214f5cfe 100644
--- a/searchlib/src/tests/util/searchable_stats/searchable_stats_test.cpp
+++ b/searchlib/src/tests/util/searchable_stats/searchable_stats_test.cpp
@@ -22,7 +22,7 @@ Test::Main()
         EXPECT_EQUAL(0u, stats.sizeOnDisk());
         {
             SearchableStats rhs;
-            EXPECT_EQUAL(&rhs.memoryUsage(MemoryUsage(100,0,0,0)), &rhs);
+            EXPECT_EQUAL(&rhs.memoryUsage(vespalib::MemoryUsage(100,0,0,0)), &rhs);
             EXPECT_EQUAL(&rhs.docsInMemory(10), &rhs);
             EXPECT_EQUAL(&rhs.sizeOnDisk(1000), &rhs);
             EXPECT_EQUAL(&stats.add(rhs), &stats);
@@ -30,7 +30,7 @@ Test::Main()
         EXPECT_EQUAL(100u, stats.memoryUsage().allocatedBytes());
         EXPECT_EQUAL(10u, stats.docsInMemory());
         EXPECT_EQUAL(1000u, stats.sizeOnDisk());
-        EXPECT_EQUAL(&stats.add(SearchableStats().memoryUsage(MemoryUsage(100,0,0,0)).docsInMemory(10).sizeOnDisk(1000)), &stats);
+        EXPECT_EQUAL(&stats.add(SearchableStats().memoryUsage(vespalib::MemoryUsage(100,0,0,0)).docsInMemory(10).sizeOnDisk(1000)), &stats);
         EXPECT_EQUAL(200u, stats.memoryUsage().allocatedBytes());
         EXPECT_EQUAL(20u, stats.docsInMemory());
         EXPECT_EQUAL(2000u, stats.sizeOnDisk());