[CMake][Fuchsia] Define asan+noexcept multilib

[CMake][Fuchsia] Define asan+noexcept multilib

Using noexcept multilib with -fno-exceptions can lead to significant
space savings when statically linking libc++abi because we don't need
all the unwinding and demangling code.

When compiling with ASan, we already get a lot of overhead from the
instrumentation itself, when statically linking libc++abi, that overhead
is even larger.

Having the noexcept variant for ASan can help significantly, we've seen
more than 50% size reduction in our system image, which offsets the cost
of having to build another multilib.

Differential Revision: https://reviews.llvm.org/D64140

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@365994 91177308-0d34-0410-b5e6-96231b3b80d8