[turbofan] basic block profiler

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 75aa5234997ae091e0e8db03d880873f77ac1309..8ee3a95b1d424d40a3e0938eea3c8e81ed098bfe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -440,6 +440,8 @@ source_set("v8_base") {
     "src/background-parsing-task.h",
     "src/bailout-reason.cc",
     "src/bailout-reason.h",
+    "src/basic-block-profiler.cc",
+    "src/basic-block-profiler.h",
     "src/bignum-dtoa.cc",
     "src/bignum-dtoa.h",
     "src/bignum.cc",
@@ -471,6 +473,8 @@ source_set("v8_base") {
     "src/compiler/access-builder.h",
     "src/compiler/ast-graph-builder.cc",
     "src/compiler/ast-graph-builder.h",
+    "src/compiler/basic-block-instrumentor.cc",
+    "src/compiler/basic-block-instrumentor.h",
     "src/compiler/change-lowering.cc",
     "src/compiler/change-lowering.h",
     "src/compiler/code-generator-impl.h",