implementation primarily differs from the former in that the asmprinter
doesn't make a zillion decisions about whether or not something will be
RIP relative or not.  Instead, those decisions are made by isel lowering
and propagated through to the asm printer.  To achieve this, we:

1. Represent RIP relative addresses by setting the base of the X86 addr
   mode to X86::RIP.
2. When ISel Lowering decides that it is safe to use RIP, it lowers to
   X86ISD::WrapperRIP.  When it is unsafe to use RIP, it lowers to
   X86ISD::Wrapper as before.
3. This removes isRIPRel from X86ISelAddressMode, representing it with
   a basereg of RIP instead.
4. The addressing mode matching logic in isel is greatly simplified.
5. The asmprinter is greatly simplified, notably the "NotRIPRel" predicate
   passed through various printoperand routines is gone now.
6. The various symbol printing routines in asmprinter now no longer infer
   when to emit (%rip), they just print the symbol.

I think this is a big improvement over the previous situation.  It does have
two small caveats though: 1. I implemented a horrible "no-rip" modifier for
the inline asm "P" constraint modifier.  This is a short term hack, there is
a much better, but more involved, solution.  2. I had to xfail an 
-aggressive-remat testcase because it isn't handling the use of RIP in the
constant-pool reading instruction.  This specific test is easy to fix without
-aggressive-remat, which I intend to do next.

llvm-svn: 74372

llvm-svn: 74366

Add feature flags for AVX and FMA and fix some SSE4A feature flag
initialization problems.

llvm-svn: 74350

Add x86 support for 'n' inline asm modifier. This will be handled target independently as part of MC work.

llvm-svn: 74336

llvm-svn: 74334

llvm-svn: 74328

llvm-svn: 74327

llvm-svn: 74326

llvm-svn: 74316

llvm-svn: 74313

llvm-svn: 74310

llvm-svn: 74275

llvm-svn: 74272

llvm-svn: 74255

llvm-svn: 74246

llvm-svn: 74186

from the asmprinter.

llvm-svn: 74184

llvm-svn: 74183

llvm-svn: 74161

llvm-svn: 74154

No need to code gen MDNodes

llvm-svn: 74150

picbase instead of inlining it.

llvm-svn: 74111

llvm-svn: 74105

llvm-svn: 74101

llvm-svn: 74097

a bunch of code from all the targets, and eliminates nondeterministic
ordering of directives being emitted in the output.

llvm-svn: 74096

llvm-svn: 74094

gv and hiddengv stub printing.

llvm-svn: 74093

llvm-svn: 74092

llvm-svn: 74091

decorateName like other stuff instead of special casing _.  Also, stick
it into GVStubs and let the normal stub printer print the stub instead 
of doing it manually.

llvm-svn: 74090

llvm-svn: 74089

llvm-svn: 74067

llvm-svn: 74066

C bindings.  Change all the backend "Initialize" functions to have C linkage.
Change the "llvm/Config/Targets.def" header to use C-style comments to avoid
compile warnings.

llvm-svn: 74026

llvm-svn: 74022

instructions, which implies that there is an explicit memory operand.  There is
(however) no explicit memory operand; although this is a store, the only memory
operand is implicit, indicated by DS:EDI.  This causes the table-generation code
for the disassembler to report an error."

Patch by Sean Callanan!

llvm-svn: 73989

cleans up the CMake-based build system a bit. Started by a patch from
Xerxes Rånby.

llvm-svn: 73969

Support for .text relocations, implementing TargetELFWriter overloaded methods for x86/x86_64.
Use a map to track global values to their symbol table indexes
Code cleanup and small fixes

llvm-svn: 73894

Handle FpSET_ST0_80 being used when ST0 is still alive.

llvm-svn: 73850