feat(v8): add fast_float to V8 deps (#844)

Refs: v8/v8@7384d3f

Author: targos

lib/update-v8/constants.js

@@ -38,6 +38,9 @@ const fp16Ignore = `!/third_party/fp16
 /third_party/fp16/src/*
 !/third_party/fp16/src/include`;
 
+const fastFloatReplace = `/third_party/fast_float/src/*
+!/third_party/fast_float/src/include`;
+
 export const v8Deps = [
   {
     name: 'trace_event',
@@ -103,5 +106,14 @@ export const v8Deps = [
     repo: 'third_party/fp16/src',
     gitignore: fp16Ignore,
     since: 124
+  },
+  {
+    name: 'fast_float',
+    repo: 'third_party/fast_float/src',
+    gitignore: {
+      match: '/third_party/fast_float/src',
+      replace: fastFloatReplace
+    },
+    since: 130
   }
 ];