LoopVectorizer: Emit memory checks into their own basic block.

This separates the check for "too few elements to run the vector loop" from the
"memory overlap" check, giving a lot nicer code and allowing to skip the memory
checks when we're not going to execute the vector code anyways. We still leave
the decision of whether to emit the memory checks as branches or setccs, but it
seems to be doing a good job. If ugly code pops up we may want to emit them as
separate blocks too. Small speedup on MultiSource/Benchmarks/MallocBench/espresso.

Most of this is legwork to allow multiple bypass blocks while updating PHIs,
dominators and loop info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172902 91177308-0d34-0410-b5e6-96231b3b80d8
BitstreamReader hasn't aged well.  It's been hacked on by various people and
has past the point of making sense.  Lets tidy things up: first step, moving
a ton of big functions out of line.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172904 91177308-0d34-0410-b5e6-96231b3b80d8
Include Support/ELF.h instead of Object/ELF.h. It is much lighter and completely
sufficient.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172916 91177308-0d34-0410-b5e6-96231b3b80d8
Documentation: replace some non-ASCII characters by equivalent markup


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172917 91177308-0d34-0410-b5e6-96231b3b80d8
Documentation: remove more mentions of Tcl

Followup for r172836


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172918 91177308-0d34-0410-b5e6-96231b3b80d8
Add a new BitstreamEntry concept, and add two helper methods for walking
through a BitstreamCursor that produce it: advance() and 
advanceSkippingSubblocks(), representing the two most common ways clients
want to walk through bitcode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172919 91177308-0d34-0410-b5e6-96231b3b80d8
fix method name.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172921 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a latent bug exposed by recent static member debug info changes.

We weren't encoding boolean constants correctly due to modeling boolean as a
signed type & then sign extending an i1 up to a byte & getting 255.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172926 91177308-0d34-0410-b5e6-96231b3b80d8
Capitalize LowerVectorIntExtend to be consistent with all the other lower functions in this file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172927 91177308-0d34-0410-b5e6-96231b3b80d8
add some optional flags to affect the way advance works.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172928 91177308-0d34-0410-b5e6-96231b3b80d8
Use MVT instead of EVT in more of the shuffle lowering code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172930 91177308-0d34-0410-b5e6-96231b3b80d8
move some private methods out of line, add a skipRecord() method.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172931 91177308-0d34-0410-b5e6-96231b3b80d8
Use MVT instead of EVT in more instruction lowering code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172933 91177308-0d34-0410-b5e6-96231b3b80d8
Remove DebugLoc argument from static function. It can easily be obtained from the SVOp passed in.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172935 91177308-0d34-0410-b5e6-96231b3b80d8
Make some helper methods static.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172936 91177308-0d34-0410-b5e6-96231b3b80d8
stringref'ize readRecord and properly capitalize it.  Add a compatibility method to easy 
the transition.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172940 91177308-0d34-0410-b5e6-96231b3b80d8
The last of PR14471 - emission of constant floats

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172941 91177308-0d34-0410-b5e6-96231b3b80d8
add an option to not auto-process abbreviations in advance()


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172946 91177308-0d34-0410-b5e6-96231b3b80d8
convert the bitstream reader itself and the IR .bc file parser to use the new advance() APIs,
simplifying things and making a bunch of details more private to BitstreamCursor.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172947 91177308-0d34-0410-b5e6-96231b3b80d8
docs: Inline documentation structure into homepage.

This brings back {Ctrl,Cmd}-f'ability, and makes some really bad
organizational choices easier to see (and therefore fix).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172949 91177308-0d34-0410-b5e6-96231b3b80d8