Merging r242331:

Merging r242331:
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r242331 | hans | 2015-07-15 14:06:16 -0700 (Wed, 15 Jul 2015) | 17 lines

Switch the release script to build with CMake by default (PR21561)

It retains the possibility to use the autoconf build with a
command-line option ('-use-autoconf'), and uses that by default on Darwin since
compiler-rt requires it on that platform.

This commit also removes the "Release-64" flavour and related logic. The script
would previously do two builds unless the '-no-64bit' flag was passed, but on
my machine and from those I asked this always ended up producing two 64-bit builds,
causing much confusion.

It also removes the -build-triple option, which caused the --build= flag to
get passed to ./configure. This was presumably intended for cross-compiling,
but none of the release testers use it. If someone does want to pass it,
they can use '-configure-flags --build=foo' instead.

Differential Revision: http://reviews.llvm.org/D10715
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@242360 91177308-0d34-0410-b5e6-96231b3b80d8