gn: Default to softfp for V8 arm simulator builds

build/config/arm.gni

Index: build/config/arm.gni
diff --git a/build/config/arm.gni b/build/config/arm.gni
index cc468d89e18e21b0c123d6fa9476a008471f0474..75c5ea9d6dba81a137ca3f4cef19ec0157f97eae 100644
--- a/build/config/arm.gni
+++ b/build/config/arm.gni
@@ -57,6 +57,9 @@ if (current_cpu == "arm" || v8_current_cpu == "arm") {
     if (arm_float_abi == "") {
       if (current_os == "android" || target_os == "android") {

[jochen (gone - plz use gerrit), 2016/07/25 15:00:32]

why not if (current_os == "chromeos" || target_os == "chromeos") {
 arm_float_abi = "hardfp"
} else {
 arm_float_abi = "softfp"
}

[Michael Achenbach, 2016/07/25 15:17:58]

When s/hardfp/hard this should be the same according to my assumptions. But I
don't trust my assumptions and I wanted to avoid flipping something that
shouldn't be flipped. So the other version is a bit more defensive. What about
linux builds with arm?

Dirk, any thoughts?

[Dirk Pranke, 2016/07/25 17:14:34]

I think the current_cpu != v8_current_cpu check should be enough, so this change
should be fine. I'm a little reluctant to have linux not match CrOS by default,
since the main reason we support linux arm is to be closer to CrOS.

         arm_float_abi = "softfp"
+      } else if (current_os == "linux" && current_cpu != v8_current_cpu) {
+        # Default to the same as Android for V8 simulator builds.
+        arm_float_abi = "softfp"
       } else {
         arm_float_abi = "hard"
       }