Building v9.x-staging is broken

[jasnell]

@nodejs/backporting ... building v9.x-staging is currently broken.

../src/node_file.cc: In function ‘void node::FTruncate(const v8::FunctionCallbackInfo<v8::Value>&)’:
../src/node_file.cc:731:36: error: ‘IsInt64’ was not declared in this scope
       !IsInt64(len_v->NumberValue())) {
                                    ^
node.target.mk:202: recipe for target '/home/james/node/node/out/Release/obj.target/node/src/node_file.o' failed
make[1]: *** [/home/james/node/node/out/Release/obj.target/node/src/node_file.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:89: recipe for target 'node' failed
make: *** [node] Error 2
james@ubuntu:~/node/node$m64 -fno-strict-aliasing -m64 -fdata-sections -ffunction-sections -O3 -O3 -fno-omit-frame-pointer -fno-rtti -fno-exceptions -std=gnu++0x -MMD -MF /home/james/node/node/out/Release/.deps//home/james/node

Likely caused by a recent errant backport commit.

[jasnell]

Specifically d5cef71#diff-fc4b9abe619d933ad78b886bab48caf3

ping @MylesBorins

[MylesBorins]

there were a couple different commits causing issues on staging, sorry about that. Was mass backporting to try and get stuff ready for a release.

The branch is now fixed 🎉