Patch by nobled <nobled@dreamwidth.org>

llvm-svn: 154772

ConstantFP::get(Type*, double) is unreliably host-specific:
it can't handle a type like PPC128 on an x86 host. It even
has a comment to that effect: "This should only be used for
simple constant values like 2.0/1.0 etc, that are
known-valid both as host double and as the target format."

Instead, use APFloat. While we're at it, randomize the floating
point value more thoroughly; it was previously limited
to the range 0 to 2**19 - 1.

PR12451.

llvm-svn: 154446

LangRef.html says:
"There are no arrays, vectors or constants of this type."

This was hitting assertions when passing the -generate-x86-mmx
option.

PR12452.

llvm-svn: 154445

llvm-svn: 151680

llvm-svn: 151596

Patch by Joey Gouly.

llvm-svn: 151489

llvm-svn: 151488

llvm-svn: 151487

Thanks zygoloid.

llvm-svn: 151481

llvm-svn: 151480

Add a random .LL file generator to stress-test different llvm components.

llvm-svn: 151479