ghc-7.10 branch regression

[Erik de Castro Lopo]

Reid Barton wrote:

> Why do we need to revert anything, can't we just make a one-character fix
> of 3.6 to 3.5 on the ghc-7.10 branch?

Even with that one character change the LLVM detection is not complete
or correct. Specifically, building the compiler will enforce the right
llvm version, but the binary-dist configure script just uses "llc" and
"opt".

Furthermore, I am pretty sure that #10292 is causes by llvm-3.5 and that
if we use llvm-3.6 buildng on Arm works. Unfortunately building and
testing on Arm takes a long time and I am still in the process of
verifying this.

Erik
-- 
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Erik de Castro Lopo
http://www.mega-nerd.com/