commit 1c4f7a378c9ef10169464cfdf20b3819e08138c7
author Andrew Hsieh <andrewhsieh@google.com> Fri Dec 21 19:03:18 2012 +0800
committer Andrew Hsieh <andrewhsieh@google.com> Fri Dec 21 19:20:58 2012 +0800
tree eeed372e90b5ab66968a78c8205f5e0ae2f2fe81
parent fb3b3632c1b32a31dd9fb8040dd876a010843fdc

Allow make-standalone-toolchain.sh to generate 64-bit host toolchain

By default make-standalone-toolchain.sh generates 32-bit host
toolchain.  User can make 64-bit host toolchain by either

1. --system=linux-x86_64 on 64-bit Linux
2. --system=darwin-x86_64 on 64-bit MacOSX

Note that
1. 64-bit windows isn't available yet
2. The script call TOOLCHAIN gcc to determin the location of libgcc.a.
   As a result, Linux toolchain must be created on Linux, and MacOSX
   toolchain must be created on MacOSX.

Change-Id: I22c183fec86423c0f744c28f00ea4d1dab98fea5