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

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 2628b9dbcfc6e7fe128adef407e4d19f78307583..be1c01bed50adf192abca3c616e7ad362ea9073b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -474,6 +474,8 @@ source_set("v8_base") {
     "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",
@@ -560,6 +562,8 @@ source_set("v8_base") {
     "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",