./wip/compiler-rt-git, LLVM runtime libraries

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Branch: CURRENT, Version: 4.0.0nb20170625, Package name: compiler-rt-4.0.0nb20170625, Maintainer: pkgsrc-users

The compiler-rt project consists of:

- builtins - a simple library that provides an implementation of the low-level
target-specific hooks required by code generation and other runtime
components. For example, when compiling for a 32-bit target, converting a
double to a 64-bit unsigned integer is compiling into a runtime call to the
"__fixunsdfdi" function. The builtins library provides optimized
implementations of this and other low-level routines, either in
target-independent C form, or as a heavily-optimized assembly.

builtins provides full support for the libgcc interfaces on supported
targets and high performance hand tuned implementations of commonly used
functions like __floatundidf in assembly that are dramatically faster than
the libgcc implementations. It should be very easy to bring builtins to
support a new target by adding the new routines needed by that target.

- sanitizer runtimes - runtime libraries that are required to run the code
with sanitizer instrumentation. This includes runtimes for:
* AddressSanitizer
* ThreadSanitizer
* UndefinedBehaviorSanitizer
* MemorySanitizer
* LeakSanitizer
* DataFlowSanitizer

- profile - library which is used to collect coverage information.

- BlocksRuntime - a target-independent implementation of Apple "Blocks"
runtime interfaces.

Required to run:
[lang/gcc48-libs] [wip/llvm-git]

Required to build:
[lang/gcc48] [devel/git-base] [pkgtools/cwrappers]

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