[turbofan] split compilation stats off from HStatistics and track high water marks

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index 9bf3a9579a540c3b2c2577bd7fe42d3de9c33136..72437d8ce1c9479cc2a814757cc50091ba94442d 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -387,6 +387,8 @@
         '../../src/codegen.h',
         '../../src/compilation-cache.cc',
         '../../src/compilation-cache.h',
+        '../../src/compilation-statistics.cc',
+        '../../src/compilation-statistics.h',
         '../../src/compiler/access-builder.cc',
         '../../src/compiler/access-builder.h',
         '../../src/compiler/ast-graph-builder.cc',
@@ -473,6 +475,8 @@
         '../../src/compiler/phi-reducer.h',
         '../../src/compiler/pipeline.cc',
         '../../src/compiler/pipeline.h',
+        '../../src/compiler/pipeline-statistics.cc',
+        '../../src/compiler/pipeline-statistics.h',
         '../../src/compiler/raw-machine-assembler.cc',
         '../../src/compiler/raw-machine-assembler.h',
         '../../src/compiler/register-allocator.cc',