Change default apple toolchain from darwin_x86_64 to ios_x86_64.
Change default apple toolchain from darwin_x86_64 to ios_x86_64.

This means that in the absence of "--config=" (or the "--cpu=" and "--ios_cpu=" flags that it indicates), c++ code using //tools/osx/crosstool will default to being built for ios_x86_64 instead of darwin_x86_64.

This is necessary to ensure that once the crosstool is used for objc, the default behavior of objc_library building for ios_x86_64 will be maintained.

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MOS_MIGRATED_REVID=132326009

bazelbuild/bazel,snnn/bazel,juhalindfors/bazel-patches,Asana/bazel,safarmer/bazel,kchodorow/bazel-1,twitter-forks/bazel,mrdomino/bazel,dropbox/bazel,variac/bazel,dslomov/bazel,spxtr/bazel,twitter-forks/bazel,katre/bazel,werkt/bazel,bazelbuild/bazel,snnn/bazel,snnn/bazel,spxtr/bazel,meteorcloudy/bazel,juhalindfors/bazel-patches,damienmg/bazel,zhexuany/bazel,kchodorow/bazel,dslomov/bazel,LuminateWireless/bazel,LuminateWireless/bazel,cushon/bazel,kchodorow/bazel-1,safarmer/bazel,zhexuany/bazel,snnn/bazel,bazelbuild/bazel,cushon/bazel,Asana/bazel,dropbox/bazel,snnn/bazel,perezd/bazel,akira-baruah/bazel,ButterflyNetwork/bazel,mrdomino/bazel,zhexuany/bazel,werkt/bazel,mikelikespie/bazel,perezd/bazel,dslomov/bazel,twitter-forks/bazel,dslomov/bazel-windows,spxtr/bazel,katre/bazel,akira-baruah/bazel,kchodorow/bazel,zhexuany/bazel,kchodorow/bazel,kchodorow/bazel-1,juhalindfors/bazel-patches,dropbox/bazel,LuminateWireless/bazel,akira-baruah/bazel,ulfjack/bazel,damienmg/bazel,spxtr/bazel,meteorcloudy/bazel,davidzchen/bazel,ulfjack/bazel,katre/bazel,safarmer/bazel,aehlig/bazel,mrdomino/bazel,mbrukman/bazel,dslomov/bazel-windows,iamthearm/bazel,dslomov/bazel-windows,iamthearm/bazel,akira-baruah/bazel,meteorcloudy/bazel,ulfjack/bazel,mikelikespie/bazel,spxtr/bazel,perezd/bazel,damienmg/bazel,spxtr/bazel,dslomov/bazel-windows,dropbox/bazel,Asana/bazel,dropbox/bazel,perezd/bazel,zhexuany/bazel,akira-baruah/bazel,akira-baruah/bazel,meteorcloudy/bazel,mbrukman/bazel,damienmg/bazel,perezd/bazel,aehlig/bazel,variac/bazel,hermione521/bazel,mrdomino/bazel,iamthearm/bazel,Asana/bazel,aehlig/bazel,variac/bazel,mrdomino/bazel,hermione521/bazel,mikelikespie/bazel,werkt/bazel,mrdomino/bazel,bazelbuild/bazel,mbrukman/bazel,dslomov/bazel,ulfjack/bazel,dslomov/bazel,safarmer/bazel,juhalindfors/bazel-patches,ButterflyNetwork/bazel,cushon/bazel,meteorcloudy/bazel,aehlig/bazel,iamthearm/bazel,kchodorow/bazel,snnn/bazel,ButterflyNetwork/bazel,davidzchen/bazel,meteorcloudy/bazel,aehlig/bazel,Asana/bazel,davidzchen/bazel,katre/bazel,iamthearm/bazel,ulfjack/bazel,zhexuany/bazel,ButterflyNetwork/bazel,kchodorow/bazel-1,aehlig/bazel,davidzchen/bazel,LuminateWireless/bazel,hermione521/bazel,twitter-forks/bazel,hermione521/bazel,Asana/bazel,juhalindfors/bazel-patches,bazelbuild/bazel,mikelikespie/bazel,LuminateWireless/bazel,werkt/bazel,twitter-forks/bazel,mbrukman/bazel,ulfjack/bazel,Asana/bazel,mikelikespie/bazel,dslomov/bazel,dropbox/bazel,variac/bazel,variac/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,spxtr/bazel,safarmer/bazel,cushon/bazel,dslomov/bazel-windows,ulfjack/bazel,kchodorow/bazel,dslomov/bazel,davidzchen/bazel,safarmer/bazel,iamthearm/bazel,variac/bazel,cushon/bazel,davidzchen/bazel,hermione521/bazel,kchodorow/bazel-1,twitter-forks/bazel,mbrukman/bazel,LuminateWireless/bazel,hermione521/bazel,meteorcloudy/bazel,kchodorow/bazel,kchodorow/bazel-1,perezd/bazel,ButterflyNetwork/bazel,werkt/bazel,katre/bazel,damienmg/bazel,twitter-forks/bazel,werkt/bazel,juhalindfors/bazel-patches,perezd/bazel,variac/bazel,dslomov/bazel-windows,davidzchen/bazel,kchodorow/bazel,mikelikespie/bazel,snnn/bazel,damienmg/bazel,juhalindfors/bazel-patches,katre/bazel,mbrukman/bazel,aehlig/bazel,cushon/bazel,damienmg/bazel